Cheesy Low-Calorie Vegetable Casserole

A Colorful, Creamy & Satisfying Vegetable Bake

This cheesy low-calorie vegetable casserole is loaded with colourful vegetables, a light and creamy herb sauce, and a delicious golden cheese topping.

The casserole shown is packed with tender broccoli, juicy cherry tomatoes, sweet bell peppers, and red onion. Everything is coated in a creamy, herb-seasoned sauce and baked until the vegetables are tender and the cheese is melted and bubbly.

It makes a wonderful lunch, light dinner, or healthy side dish. You can also customise the vegetables based on what you have at home.

Important note: This recipe can be part of a balanced, calorie-conscious eating plan, but eating one food “day and night” does not guarantee rapid weight loss. Sustainable results usually come from an overall balanced diet and appropriate portions.

Ingredients

For the Vegetable Casserole

4 cups broccoli florets
1½ cups cherry tomatoes
1 large yellow or orange bell pepper, chopped
1 red bell pepper, chopped
½ medium red onion, sliced
1 tablespoon olive oil
½ teaspoon salt, or to taste
¼ teaspoon black pepper
½ teaspoon garlic powder
½ teaspoon dried Italian herbs

For the Creamy Herb Sauce

1 cup plain Greek yogurt
½ cup low-fat cottage cheese
2 cloves garlic, finely minced
1 tablespoon fresh lemon juice
2 tablespoons fresh parsley, finely chopped
1 tablespoon fresh dill, chopped
½ teaspoon dried oregano
¼ teaspoon black pepper
Salt, to taste

For the Cheese Topping

¾ cup shredded mozzarella cheese
¼ cup grated Parmesan cheese

Optional Additions

1 teaspoon Dijon mustard
Red pepper flakes for heat
1 cup sliced mushrooms
1 small zucchini, sliced
Fresh basil
Extra herbs for garnish

Instructions

Step 1: Preheat the oven.

Preheat your oven to 400°F (200°C).

Lightly grease a large baking dish with a small amount of olive oil or cooking spray.

A casserole dish measuring approximately 9×13 inches works well for this recipe.

Step 2: Prepare the Broccoli

Wash the broccoli thoroughly and cut it into medium-sized florets.

Try to keep the pieces relatively similar in size so they cook evenly.

If your broccoli florets are very large, cut them into smaller pieces. This helps them become tender without overcooking the other vegetables.

Place the prepared broccoli into a large mixing bowl.

Step 3: Prepare the Remaining Vegetables

Wash the cherry tomatoes and leave them whole.

Cut the yellow or orange bell pepper into bite-sized chunks.

Chop the red bell pepper.

Thinly slice the red onion.

Add all the vegetables to the bowl with the broccoli.

Drizzle with 1 tablespoon olive oil and season with salt, black pepper, garlic powder, and dried Italian herbs.

Toss everything together until the vegetables are lightly coated.

Step 4: Make the Creamy Herb Sauce

In a medium bowl, combine:

Greek yogurt
Cottage cheese
Minced garlic
Fresh lemon juice
Chopped parsley
Fresh dill
Dried oregano
Black pepper
Salt

Mix well until combined.

For an extra-smooth sauce, you can blend the cottage cheese and Greek yoghurt together before adding the remaining ingredients.

The sauce should be creamy but thick enough to coat the vegetables.

If it seems extremely thick, add 1–2 tablespoons of water or milk to loosen it slightly.

Step 5: Combine the Vegetables and Sauce

Pour about three-quarters of the creamy herb sauce over the vegetables.

Toss gently until the broccoli, peppers, onion, and tomatoes are lightly coated.

Do not worry if every piece is not completely covered. The vegetables will release some moisture as they bake, creating a delicious creamy mixture.

Transfer the vegetables to your prepared casserole dish.

Spread them evenly across the dish.

Step 6: Add the Remaining Sauce

Spoon the remaining creamy herb sauce over the top of the vegetables.

Use the back of a spoon to spread it gently.

This creates a rich and creamy layer throughout the casserole without requiring a large amount of heavy cream.

Step 7: Add the Cheese

Sprinkle the shredded mozzarella evenly over the vegetables.

Finish with the grated Parmesan cheese.

The mozzarella creates a delicious melted topping, while the Parmesan adds extra savoury flavour and helps the surface become lightly golden.

Step 8: Bake the Casserole

Cover the baking dish loosely with foil.

Bake for 20 minutes.

After 20 minutes, remove the foil and continue baking for another 10–15 minutes.

The casserole is ready when:

The broccoli is tender but still has some texture.
The tomatoes are soft and juicy.
The peppers are tender.
The cheese is melted and lightly golden.

For a more golden cheese topping, place the casserole under the broiler for 1–2 minutes.

Watch it carefully during broiling because the cheese can brown quickly.

Step 9: Rest Before Serving

Remove the casserole from the oven and allow it to rest for 5–10 minutes.

This gives the creamy sauce time to settle slightly.

Sprinkle with fresh parsley, dill, or basil before serving if desired.

Serve warm and enjoy!

Recipe Description

This vegetable casserole is a wonderful example of how simple vegetables can be transformed into a comforting and satisfying meal.

The broccoli provides a hearty base, while the colourful bell peppers add natural sweetness. Cherry tomatoes become soft and juicy during baking, creating little bursts of flavour throughout the dish.

Red onion adds a mild savoury flavour that becomes sweeter as it cooks.

The creamy Greek yoghurt and cottage cheese mixture provides richness while also adding protein. Fresh herbs, garlic, and lemon juice brighten the flavour and prevent the casserole from tasting heavy.

Finally, a modest layer of mozzarella and Parmesan creates the delicious melted cheese topping that makes this dish feel comforting and satisfying.

Recipe Notes

Use Fresh Vegetables

Fresh broccoli and firm bell peppers work especially well in this casserole.

Frozen broccoli can also be used, but it should be thawed and drained well first. Frozen vegetables often release extra water during baking.

Don’t Overcook the Broccoli

The broccoli should become tender but should not turn completely mushy.

Keep an eye on the casserole during the final few minutes of baking.

Cooking time may vary depending on the size of your vegetable pieces and your oven.

Choose Thick Greek Yogurt

Thick Greek yoghurt works best for the creamy sauce.

Very thin yoghurt may release additional liquid during baking.

If your yoghurt is thin, you can strain it briefly before using.

Cottage Cheese Adds Creaminess

Cottage cheese gives the sauce a creamy texture and adds protein.

If you do not enjoy its texture, blend it before mixing it with the other sauce ingredients.

This creates a smoother, creamier result.

Helpful Tips

1. Cut Vegetables Evenly

Try to cut the broccoli and peppers into similar-sized pieces.

This helps everything cook evenly.

Large pieces may remain firm while smaller pieces become too soft.

2. Don’t Add Too Much Oil

Vegetables do not need a large amount of oil to roast successfully.

One tablespoon is usually enough to lightly coat the vegetables.

This helps keep the recipe lighter while still adding flavour.

3. Add More Protein

If you want to turn this casserole into a more filling main meal, add one of the following:

1½ cups cooked shredded chicken
1 can chickpeas, drained and rinsed
1 cup cooked white beans
Lean ground turkey
Cooked lentils

Add cooked protein before baking.

4. Make It Vegetarian

The basic recipe is vegetarian.

For a vegetarian meal, make sure any Parmesan or cheese you use fits your preferred dietary requirements.

5. Make It Lower in Dairy

You can reduce the amount of cheese or use your preferred lower-fat cheese.

For a dairy-free version, experiment with a plant-based yoghurt and cheese alternative suitable for baking.

The texture and flavour may vary.

6. Add More Vegetables

This recipe is easy to customise.

Try adding:

Zucchini
Mushrooms
Cauliflower
Spinach
Green beans
Brussels sprouts

Be aware that watery vegetables such as zucchini may release additional moisture.

Serving Suggestions

This casserole can be enjoyed in several ways.

As a Light Main Dish

Serve a generous portion with a fresh side salad.

For additional protein, add grilled chicken, fish, beans, or chickpeas.

As a Side Dish

Pair it with:

Grilled chicken
Baked salmon
Turkey
Lean beef
Mediterranean-style fish

For Meal Prep

Divide the cooled casserole into individual containers.

Pair each serving with your preferred protein source for convenient lunches.

Servings

This recipe makes approximately the following:

6 servings as a side dish

4 servings as a light main meal

Serving sizes can be adjusted depending on what else you serve with the casserole.

Preparation and Cooking Time

Preparation Time: 20 minutes
Cooking Time: 30–35 minutes
Resting Time: 5–10 minutes

Total Time: Approximately 55–65 minutes

Nutritional Information

Approximate nutrition per serving

Based on 6 servings:

Calories: 180–230 kcal
Protein: 11–14 g
Carbohydrates: 16–20 g
Fat: 8–11 g
Fiber: 4–6 g
Sugar: 7–10 g
Sodium: Varies depending on the cheese and added salt

These values are estimates and may vary depending on the exact brands, ingredients, and serving sizes used.

Adding chicken, beans, extra cheese, or other ingredients will change the nutritional values.

Potential Benefits

1. Contains a Variety of Vegetables

This casserole includes broccoli, tomatoes, peppers, and onion.

Including a variety of vegetables can add different flavours, textures, vitamins, minerals, and fibre to your overall eating pattern.

2. Provides Dietary Fiber

Vegetables naturally contribute dietary fibre.

Fibre is an important part of a balanced diet and can help support normal digestion and contribute to feelings of fullness.

3. Contains Protein

Greek yoghurt, cottage cheese, and cheese contribute protein to the recipe.

If you need a higher-protein meal, you can add chicken, beans, or another protein source.

4. Lower in Calories Than Many Creamy Casseroles

Traditional creamy casseroles may use large amounts of butter, heavy cream, or rich sauces.

This version uses Greek yoghurt and cottage cheese to create creaminess without relying entirely on heavy cream.

However, the total calorie content still depends on portion size and the exact ingredients used.

5. Colorful and Satisfying

A variety of colourful vegetables can make meals more visually appealing and enjoyable.

The creamy sauce and melted cheese also make the vegetables feel comforting and satisfying.

Frequently Asked Questions

Q1: Can I make this casserole ahead of time?

Yes.

You can prepare the vegetables and creamy sauce ahead of time.

Store them separately in the refrigerator and assemble before baking.

For the best texture, bake the casserole shortly before serving.

Q2: Can I use frozen broccoli?

Yes.

Thaw the frozen broccoli first and drain it well.

Excess water can make the casserole watery.

Q3: Can I add chicken?

Absolutely!

Add approximately 1½ to 2 cups of cooked shredded or diced chicken.

Mix it with the vegetables before adding the sauce and baking.

Q4: Can I make this recipe vegan?

Yes, with substitutions.

Use a thick plant-based yoghurt, a dairy-free cottage cheese alternative if available, and plant-based shredded cheese.

The final flavour and texture may differ from the original recipe.

Q5: Why is my casserole watery?

Vegetables naturally release moisture during cooking.

To reduce excess liquid:

Dry-washed vegetables well.
Avoid overcrowding the dish.
Use thick Greek yoghurt.
Drain frozen vegetables thoroughly.
Avoid adding too much extra liquid.

Q6: Can I use cauliflower instead of broccoli?

Yes!

Cauliflower works very well in this recipe.

You can replace all or half of the broccoli with cauliflower florets.

Q7: How do I store leftovers?

Allow the casserole to cool completely.

Store leftovers in an airtight container in the refrigerator for up to 3 days.

Q8: How do I reheat it?

Reheat individual portions in the microwave until hot.

For a larger amount, reheat in the oven at 350°F (175°C) until warmed through.

You may cover the dish with foil while reheating to prevent the cheese from becoming too brown.

Q9: Can I freeze this casserole?

Freezing is possible, but the texture of the vegetables and yoghurt-based sauce may change after thawing.

For the best texture, this casserole is recommended fresh or refrigerated for a few days.

Q10: Will eating this casserole alone make me lose weight quickly?

No single recipe can guarantee quick weight loss.

This casserole can be a nutritious, lower-calorie meal option, but weight changes depend on many factors, including your overall diet, portion sizes, activity level, and individual needs.

For sustainable results, enjoy a variety of balanced foods rather than relying on only one dish day and night.

Final Thoughts

This cheesy low-calorie vegetable casserole is fresh, colourful, creamy, and incredibly satisfying.

With tender broccoli, juicy cherry tomatoes, sweet peppers, savoury onion, a creamy herb sauce, and a golden melted cheese topping, it’s a delicious way to enjoy more vegetables.