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A pan of freshly baked High-Protein Peanut Butter–Banana Oatmeal Bars cooling on a wire rack.

Peanut Butter Banana Oatmeal Bars: A High-Protein Snack You’ll Love


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  • Author: Amy
  • Total Time: TT40M
  • Yield: 9 bars 1x
  • Diet: Vegetarian

Description

These chewy and wholesome Peanut Butter Banana Oatmeal Bars are packed with protein, natural sweetness, and hearty oats—perfect for a make-ahead breakfast or energizing snack.


Ingredients

Scale
  • 1¼ cups old-fashioned rolled oats (not instant!)
  • ½ cup all-purpose flour
  • ½ cup whole-wheat flour (or swap for more all-purpose)
  • 1½ tsp baking powder
  • 1½ tsp ground cinnamon (because everything’s better with cinnamon)
  • ½ tsp salt
  • 1¼ cups mashed ripe banana (about 3 medium—the spottier, the sweeter!)
  • 6 tbsp smooth natural peanut butter, divided (no sugar added works best)
  • ¼ cup whole milk (or almond milk for dairy-free)
  • ¼ cup unsweetened applesauce (or sub more banana)
  • 3 tbsp honey (or maple syrup for vegans)
  • 1 large egg (or flax egg if needed)
  • 2 tsp vanilla extract

Instructions

  1. Preheat your oven to 350°F (175°C). Lightly coat a 9-inch square baking pan with cooking spray.
  2. In a small bowl, whisk together the oats, flours, baking powder, cinnamon, and salt. Set aside.
  3. In a large bowl, whisk together mashed banana, 4 tablespoons peanut butter, milk, applesauce, honey, egg, and vanilla until smooth.
  4. Fold the dry ingredients into the wet mixture until just combined. Do not overmix.
  5. Pour the batter into the prepared pan. Dollop the remaining 2 tablespoons of peanut butter over the top, and use a toothpick to swirl it gently for a marbled effect.
  6. Bake for 30 minutes, or until the edges begin to pull away from the sides of the pan and a toothpick inserted into the center comes out clean.
  7. Let cool in the pan for at least 10 minutes before slicing into bars.

Notes

  • Freeze overripe bananas and thaw when ready to bake for easier mashing.
  • You can substitute almond or sunflower seed butter for peanut butter if preferred.
  • Store bars in an airtight container at room temperature for up to 3 days or refrigerate for up to 5 days.
  • Prep Time: PT10M
  • Cook Time: CT30M
  • Category: high protein breakfasts
  • Method: Baking
  • Cuisine: American

Nutrition

  • Serving Size: 1 bar
  • Calories: 180 kcal
  • Sugar: 8 g
  • Sodium: 120 mg
  • Fat: 7 g
  • Saturated Fat: 1 g
  • Unsaturated Fat: 5.5 g
  • Trans Fat: 0 g
  • Carbohydrates: 25 g
  • Fiber: 3 g
  • Protein: 6 g
  • Cholesterol: 20 mg