These soft-baked peanut butter and banana oat bars make an easy, portable breakfast or snack the whole family will enjoy. They turn classic peanut butter oatmeal into a mess-free bar that’s perfect for school lunches, park snacks, or a quick morning bite.
I developed this recipe because my kids love peanut butter oatmeal but it’s often messy. Adding a ripe banana ensures the bars stay moist and soft — addressing the common complaint of dry oat bars — while contributing natural sweetness. Because the recipe uses only one banana, it’s ideal when you have a single overripe banana and not quite enough for banana bread or muffins.
These bars are simple, made from pantry-friendly ingredients: rolled oats, a bit of flour, peanut butter, a banana, eggs and a touch of maple syrup. They deliver whole-grain energy from the oats and healthy fats from the nut butter, so they’re satisfying and practical for busy families. Leftovers make a speedy breakfast on hectic mornings.
Why you’ll love these soft-baked oatmeal bars
- Portable — easy to pack for school, the park, or travel (substitute sunbutter for a peanut-free option).
- No refined sugar — sweetened with maple syrup and a ripe banana.
- Less messy — cleaner than a bowl of oatmeal, especially with young children.
- Satisfying — rolled oats provide lasting energy and a filling texture.
- Kid-friendly flavor — peanut butter and banana is a favorite combination for little ones and adults alike.
Equipment
- 8″x8″ baking pan
- Two bowls (one microwave-safe)
- Spatula
- Fork or whisk
- Parchment paper or cooking spray (optional but helpful)
Ingredients
Dry ingredients
- 1 cup rolled oats (regular rolled or quick oats; avoid instant)
- ⅓ cup all-purpose flour
- 1 teaspoon cinnamon
- 1 teaspoon baking powder
- ⅛ teaspoon salt
Wet ingredients
- 2 tablespoons butter (use salted or increase salt if using unsalted)
- 2 eggs, room temperature
- 3 tablespoons creamy peanut butter (crunchy works too if preferred)
- 2 tablespoons maple syrup
- ½ teaspoon vanilla extract
- 1 medium overripe banana, mashed
Instructions
Step 1: Preheat the oven to 325°F. In a bowl, stir together the oats, flour, cinnamon, baking powder, and salt.
Step 2: In a microwave-safe bowl, melt the butter. Whisk in the eggs and vanilla. Add the mashed banana, then stir in the peanut butter and maple syrup until smooth.
Step 3: Fold the wet mixture into the dry ingredients until just combined.
Step 4: Prepare the 8×8 pan with parchment or a generous spray of cooking spray. Spread the batter evenly in the pan.
Step 5: Bake for 30 minutes. Allow to cool, then cut into squares.
Serving suggestions
These bars are a complete, grab-and-go breakfast on their own, with oats, eggs, and fruit. If you’d like more fruit, serve an additional banana or a small cup of berries on the side.
Storage and reheating
Storing
Store bars in an airtight container in the refrigerator for up to 5 days.
Freezing
Freeze bars in a freezer-safe container or bag for up to 3 months. Portion them before freezing to avoid repeated thawing and refreezing.
Reheating
Serve chilled or warm them in a toaster oven or conventional oven for 3–5 minutes, or microwave for 15–20 seconds.
FAQ
Can I substitute the sweetener?
If you don’t have maple syrup, honey works as an alternative. Brown sugar can also be used — if you use granulated or brown sugar, soften the butter lightly and cream it with the sugar before adding the eggs.
What if my banana isn’t ripe?
Unripe bananas are harder to mash and less sweet. To ripen a banana quickly, bake it in the peel on a parchment-lined sheet at 300°F for 15–20 minutes (rotate halfway) or peel and microwave in 30-second intervals until soft.
How do I remove the bars from the pan?
If you used parchment, lift the bars out by the paper. If not, let the pan cool slightly, invert it onto a cooling rack, then transfer the slab to a cutting board before slicing.
Allergen substitutions?
Substitute almond butter, cashew butter, or sunbutter for peanut butter if needed. To make the recipe dairy-free, replace butter with coconut oil. For gluten-free, use a trusted gluten-free flour and certified gluten-free oats.
Recipe
Peanut Butter and Banana Oat Bars — Soft-Baked
Servings: 9 | Prep time: 10 mins | Cook time: 30 mins | Total time: 40 mins
Ingredients
- 1 cup rolled oats
- ⅓ cup flour
- 1 teaspoon cinnamon
- 1 teaspoon baking powder
- ⅛ teaspoon salt
- 2 tablespoons butter
- 2 eggs
- 3 tablespoons peanut butter
- 2 tablespoons maple syrup
- ½ teaspoon vanilla
- 1 medium overripe banana
Instructions
- Preheat oven to 325°F. Mix oats, flour, cinnamon, baking powder, and salt in a bowl.
- Melt butter, then whisk in eggs, vanilla, peanut butter, maple syrup, and mashed banana until smooth.
- Fold wet ingredients into dry until just combined. Pour into a greased 8×8 pan.
- Bake 30 minutes. Cool, then cut into squares.
Notes
For chewier, stickier bars, reduce flour to ¼ cup.
Nutrition (per serving, approximate)
Calories: 124 kcal • Carbs: 17 g • Protein: 4 g • Fat: 4 g • Fiber: 2 g • Sugar: 5 g