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Mixed Berry Peanut Butter Oat Crumble Bars

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Mixed Berry Peanut Butter Oat Crumble Bars

These wholesome oat bars have a soft, chewy oat crust, a naturally sweet mixed berry filling, and a crunchy golden oat crumble topping. They’re perfect for breakfast, snacks, or a healthy dessert.

Prep Time: 15 minutes
Cook Time: 35-40 minutes
Total Time: 50-55 minutes
Servings: 12 bars

Ingredients

For the Oat Crumble

  • 3 cups (270 g) old-fashioned rolled oats
  • 1 cup (120 g) oat flour (or blend rolled oats into a fine flour)
  • ½ cup (120 g) natural peanut butter
  • â…“ cup (80 ml) maple syrup or honey
  • ¼ cup (60 ml) melted coconut oil or unsalted butter
  • 1 teaspoon vanilla extract
  • 1 teaspoon ground cinnamon
  • ¼ teaspoon salt
  • 1 teaspoon baking powder

For the Berry Filling

  • 3 cups mixed berries (fresh or frozen)
    • Blueberries
    • Raspberries
    • Blackberries
  • 2 tablespoons maple syrup or honey (optional)
  • 1 tablespoon lemon juice
  • 2 teaspoons cornstarch or arrowroot powder
  • 1 teaspoon vanilla extract

Instructions

Step 1: Prepare the Oven

  • Preheat oven to 350°F (175°C).
  • Line an 8×8-inch baking pan with parchment paper.

Step 2: Make the Filling

  1. Combine berries, lemon juice, maple syrup, vanilla, and cornstarch.
  2. Toss gently until evenly coated.
  3. Set aside for 5 minutes.

Step 3: Make the Oat Mixture

  1. In a large bowl combine:
    • Rolled oats
    • Oat flour
    • Cinnamon
    • Baking powder
    • Salt
  2. Add:
    • Peanut butter
    • Maple syrup
    • Melted coconut oil
    • Vanilla
  3. Mix until crumbly but moist.

Step 4: Build the Bars

  • Press about two-thirds of the oat mixture firmly into the prepared pan.
  • Spread the berry filling evenly over the crust.
  • Sprinkle the remaining oat mixture on top without pressing too hard.

Step 5: Bake

Bake for 35–40 minutes, or until:

  • The topping is golden brown.
  • The berry filling is bubbling around the edges.

Step 6: Cool

  • Cool completely in the pan for at least 1 hour.
  • Refrigerate for 30 minutes for cleaner slices.
  • Cut into 12 bars.

Tips

  • Frozen berries work perfectly—no need to thaw.
  • For extra crunch, add ¼ cup chopped almonds or walnuts to the topping.
  • A sprinkle of flaky sea salt before baking adds great flavor.
  • For sweeter bars, increase maple syrup to ½ cup.

Storage

  • Room Temperature: 2 days in an airtight container.
  • Refrigerator: Up to 1 week.
  • Freezer: Up to 3 months. Wrap each bar individually before freezing.

Variations

  • Almond Butter: Replace peanut butter with almond butter.
  • Chocolate: Add ½ cup dark chocolate chips.
  • Protein Version: Mix 1 scoop vanilla protein powder into the oat mixture.
  • Gluten-Free: Use certified gluten-free oats and oat flour.
  • Vegan: Use maple syrup instead of honey.

Nutrition (Per Bar)

  • Calories: 235
  • Protein: 7 g
  • Carbohydrates: 28 g
  • Fat: 11 g
  • Fiber: 5 g
  • Sugar: 9 g

These bars are hearty, naturally sweetened, and packed with whole grains, healthy fats, and antioxidant-rich berries, making them an excellent make-ahead breakfast or satisfying snack.

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