Blueberry Banana Oat Bars

Name: Blueberry Banana Oat Bars
Prep time: 5 min
Cook time: 30 min
Total time: 35 min
Ingredients: 1 ripe banana (mashed); 2 tbsp almond butter; 1/3 cup whole milk kefir; 1 cup quick oats; 1 tbsp oat flour; 1 tbsp ground flaxseed; ½ tsp baking powder; ½ cup frozen blueberries; dash cinnamon; 1 scoop collagen (optional)

by Kelsey Romano on January 23, 2026

Jump to Recipe

These blueberry banana oat bars are the perfect breakfast on the go or delicious snack to have on hand, especially if you have little ones! They are naturally sweetened with banana, are incredibly nutrient dense, and are so easy to make.

Why You’ll Love This Recipe

Perfect for busy mornings. These blueberry banana oat bars are an easy, grab-and-go breakfast or snack for hectic mornings.
Comforting & cozy. Warm banana, cinnamon, and baked oats make these feel like a comforting hug in bar form.
Easy to make. One bowl, simple ingredients, and minimal prep — you truly can’t mess these up.
Naturally sweetened. Sweetened with ripe banana and blueberries, no added sugar required.
Great for meal prep. Bake once and enjoy all week — these bars store beautifully in the fridge or freezer.
Nutrient-dense. Packed with fiber from oats and flaxseed, healthy fats from nut butter, and optional collagen for added protein.
Fits many diets and lifestyles. These oat bars are gluten-free (if using certified GF oats) and refined sugar–free.
Versatile. Easily swap the fruit, nut butter, or add-ins based on what you have on hand.

ingredients for blueberry banana oat bars

Ingredients & Substitutions

Banana. 1 ripe banana, mashed. This provides natural sweetness and moisture for these blueberry banana oat bars. The riper, the better.
Egg. 1 egg for structure. You can sub with a flax egg if needed.
Nut butter. 2 tbsp almond butter or peanut butter. Use smooth, unsweetened, and runny nut butter.
Kefir. 1/3 cup plain whole milk kefir. Adds moisture and gut-friendly probiotics. You can sub with yogurt or milk of choice.
Quick oats. 1 cup quick oats. You can use rolled oats, but the texture will be slightly heartier.
Oat flour. 1 tbsp oat flour helps bind everything together. You can grind oats into flour if needed.
Flaxseed. 1 tbsp ground flaxseed for fiber and healthy fats.
Baking powder. 1/2 tsp to help the bars rise slightly.
Frozen blueberries. 1/2 cup frozen blueberries. No need to thaw.
Cinnamon. A dash for warmth and flavor.
Collagen (optional). A scoop for added protein — completely optional.

How to Make Blueberry Banana Oat Bars

Step 1

Prep the pan and preheat oven. Preheat oven to 350. Grease a loaf pan with butter and line with parchment paper for easy removal.

Step 2

Mix wet ingredients. In a large bowl, add the mashed banana, kefir, egg, and nut butter. Stir until fully combined and smooth.

Step 3

Add dry ingredients. Stir in the oats, oat flour, flaxseed, baking powder, and cinnamon until just combined.

Step 4

Fold in blueberries. Gently stir in the frozen blueberries, being careful not to overmix.

Step 5

Bake. Pour the mixture into the prepared loaf pan. Bake for 30–35 minutes, or until set and soft but not doughy in the center. Let cool before slicing. Enjoy these blueberry banana oat bars!

Expert Tips

Use a very ripe banana for the best sweetness and texture.
Don’t overbake. These blueberry banana oat bars should be moist and tender, not dry.
Let them cool completely before slicing for clean edges.
Use frozen blueberries straight from the freezer to prevent excess moisture.
Want more protein? Add collagen, Greek yogurt on top, or enjoy with nut butter.

Can I make these vegan?

Yes! Swap the egg for a flax egg and use dairy-free yogurt or milk instead of kefir.

Can I use a different fruit?

Absolutely. Raspberries, chopped strawberries, or chocolate chips all work great.

Are these good for meal prep?

Yes — they’re perfect for meal prep and taste great even after a few days.

How do I store them?

Store in an airtight container in the fridge for up to 4–5 days, or freeze for up to 2 months.