High-Protein Veggie Breakfast Casserole
Start your day with a warm, savory breakfast that is packed with protein, vegetables, and cheesy goodness. This High-Protein Veggie Breakfast Casserole combines fluffy eggs with creamy cottage cheese, colorful bell peppers, mushrooms, tender kale or spinach, and melted Colby-Jack cheese. It is easy enough for a weekday breakfast but special enough for a weekend brunch. The casserole can also be prepared ahead, making it a convenient option for meal prep when you want a satisfying breakfast ready to enjoy throughout the week.
Prep Time: 15 minutes
Cook Time: 35 to 40 minutes
Total Time: 50 to 55 minutes
Servings: 6
Ingredients
Base & Proteins
8 large eggs
½ cup low-fat cottage cheese, blended into the egg base
⅓ cup milk
1½ cups shredded Colby-Jack cheese, divided
Veggies & Aromatics
1 tablespoon extra-virgin olive oil
1 medium red bell pepper, diced
1 cup sliced mushrooms, such as baby bella or button
4 cups chopped kale or baby spinach, stems removed
½ cup diced yellow onion
Seasonings
½ teaspoon garlic powder
¼ teaspoon salt, divided
¼ teaspoon freshly ground black pepper
Instructions
Preheat your oven to 375°F (190°C). Lightly grease an 8-inch or 9-inch square baking dish, or use a similar-size casserole dish.
Add the cottage cheese to a blender and blend until smooth and creamy. Add the eggs and milk, then blend or whisk until the mixture is well combined. Blending the cottage cheese helps create a smoother egg base while adding extra protein and creaminess.
Heat the extra-virgin olive oil in a large skillet over medium heat. Add the diced yellow onion and red bell pepper. Sprinkle in half of the salt and cook for about 4 to 5 minutes, stirring occasionally, until the vegetables begin to soften.
Add the sliced mushrooms and cook for another 4 to 5 minutes. Continue cooking until the mushrooms are tender and most of their moisture has evaporated.
Add the chopped kale or baby spinach to the skillet. Cook for 2 to 3 minutes, stirring frequently, until the greens are wilted and any excess moisture has cooked away. Remove the skillet from the heat and allow the vegetables to cool slightly.
In a large bowl, combine the blended egg mixture with the garlic powder, remaining salt, and freshly ground black pepper. Stir in ¾ cup of the shredded Colby-Jack cheese.
Add the sautéed vegetables to the egg mixture and gently stir until everything is evenly distributed.
Pour the mixture into the prepared baking dish. Spread the vegetables evenly so each serving gets a good combination of greens, peppers, mushrooms, and onions.
Sprinkle the remaining ¾ cup of Colby-Jack cheese evenly over the top.
Place the casserole in the preheated oven and bake for 35 to 40 minutes, or until the center is set and the top is lightly golden. The center should no longer look wet or liquid when gently shaken.
Remove the casserole from the oven and let it rest for 5 to 10 minutes before slicing. This helps the eggs finish setting and makes the casserole easier to cut into neat portions.
Serve warm on its own or alongside fresh fruit, avocado, tomatoes, or a simple green salad.
Tips
For the creamiest texture, blend the cottage cheese before combining it with the eggs. If you prefer a little texture, you can simply whisk the cottage cheese into the eggs instead.
Make sure you cook the vegetables before adding them to the egg mixture. Mushrooms and leafy greens contain a considerable amount of water, and cooking them first prevents the casserole from becoming watery.
If you are using frozen spinach, thaw it completely and squeeze out as much water as possible before cooking. Excess moisture is one of the most common reasons egg casseroles become soft or watery.
Do not overbake the casserole. Once the center is fully set, remove it from the oven. Eggs become firmer as they continue to cook from residual heat, so baking for much longer can result in a dry or rubbery texture.
Let the casserole rest for several minutes before serving. Cutting immediately after baking can cause the portions to lose their shape.
For evenly cooked portions, spread the vegetables throughout the egg mixture instead of leaving them concentrated in one area of the baking dish.
The Colby-Jack cheese can be shredded just before using for the best melting texture. Pre-shredded cheese also works well when convenience is important.
For meal prep, cool the casserole completely before cutting it into portions. Store individual slices in airtight containers in the refrigerator for up to 4 days.
Reheat individual servings in the microwave until warmed through. You can also reheat them in a covered oven-safe dish for a gentler texture.
Variations
Mediterranean Variation
Give this casserole a Mediterranean-inspired flavor by adding chopped sun-dried tomatoes, crumbled feta, Kalamata olives, and a sprinkle of dried oregano. The creamy eggs pair especially well with the salty feta and tangy vegetables.
Extra Vegetable Variation
Increase the vegetable content by adding diced zucchini, broccoli, asparagus, or tomatoes. Cook vegetables with higher water content before adding them to the egg mixture to prevent excess moisture.
Turkey Sausage Variation
For an even heartier and more protein-rich breakfast, add cooked and crumbled turkey sausage. Brown the sausage separately, drain any excess grease, and stir it into the egg and vegetable mixture.
Spicy Variation
Add diced jalapeño, crushed red pepper flakes, or a dash of your favorite hot sauce. You can also replace some of the Colby-Jack with Pepper Jack cheese for extra heat.
Herb Variation
Fresh herbs can completely change the flavor of the casserole. Try chopped parsley, chives, basil, dill, or cilantro. Add delicate fresh herbs toward the end of preparation to keep their flavor bright.
Cheese Variation
Colby-Jack can be replaced with cheddar, Monterey Jack, mozzarella, Swiss cheese, or a combination of your favorite cheeses. For a stronger flavor, try adding a small amount of Parmesan.
Q&A
Can I make this breakfast casserole ahead of time?
Yes. You can prepare the casserole the evening before, cover it tightly, and refrigerate it until you are ready to bake. You may need to add a few extra minutes to the baking time if it goes directly from the refrigerator into the oven.
Can I use spinach instead of kale?
Absolutely. Baby spinach is a great substitute for kale and cooks quickly. If using frozen spinach, thaw and squeeze it very well before adding it.
Can I freeze this casserole?
Yes. Allow the baked casserole to cool completely, cut it into individual portions, and wrap them well before freezing. For the best texture, use frozen portions within about 2 months and thaw them overnight in the refrigerator before reheating.
How do I prevent the casserole from becoming watery?
Cook the vegetables thoroughly before adding them to the eggs. Mushrooms, spinach, and kale can release moisture during cooking, so allow excess liquid to evaporate before combining them with the egg mixture.
Can I use full-fat cottage cheese?
Yes. Full-fat cottage cheese works well and will produce a slightly richer texture. Low-fat cottage cheese keeps the recipe lighter while still adding protein and creaminess.
What size baking dish should I use?
An 8-inch or 9-inch square baking dish works well for this quantity. A similar-size casserole dish can also be used. Avoid using a very large dish because the casserole will become too thin and may cook more quickly.
How do I know when the casserole is done?
The center should be completely set and should not appear liquid. Gently shake the dish. If the center moves like liquid eggs, continue baking for a few more minutes.
Can I add meat to this recipe?
Yes. Cooked turkey sausage, chicken sausage, lean ham, or cooked bacon can be added. Make sure any meat is fully cooked before adding it to the casserole.
Nutrition
Approximate nutrition per serving, based on 6 servings:
Calories: 290
Protein: 22 g
Carbohydrates: 8 g
Fat: 19 g
Fiber: 2 g
Sugar: 4 g
Sodium: 430 mg
Nutrition information is an estimate and may vary depending on the exact brands, cheese, milk, cottage cheese, and quantities used.
Conclusion
This High-Protein Veggie Breakfast Casserole is a simple and delicious way to enjoy a protein-rich breakfast filled with wholesome vegetables. It is creamy, cheesy, satisfying, and easy to prepare ahead of time. Serve it fresh from the oven for a comforting family breakfast or portion it into slices for convenient weekday meal prep.
#HighProteinBreakfast #VeggieBreakfast #BreakfastCasserole #HealthyBreakfast #MealPrep