This Peanut Butter Banana Oatmeal Bars recipe makes a wholesome, satisfying snack or breakfast on the go. With simple, everyday ingredients and natural sweetness from ripe bananas, these baked oatmeal bars are easy to prepare and perfect for busy mornings, lunchboxes, or an afternoon pick-me-up.
This recipe balances oats, flour, peanut butter, and mashed banana into a moist, chewy bar without relying on large amounts of added sugar. I love how the ripe bananas contribute natural sweetness and moisture, so you can enjoy a treat that feels indulgent but still wholesome. These bars work well for kids and adults alike and can be served warm or chilled.
I’ve tested many oatmeal bar variations and keep coming back to this one for its texture and flavor. Think of them as breakfast bars or a healthy snack — they travel well, freeze nicely, and are easy to portion for later.
Ingredients
All-purpose flour – The base that helps the bars hold together.
Rolled oats – Old-fashioned oats give a chewy texture; quick oats will work in a pinch.
Light brown sugar – Adds a touch of sweetness; you can reduce or swap for a natural sweetener if preferred.
Baking soda – Helps with lightness and texture.
Peanut butter – Use creamy or crunchy depending on preference.
Mashed banana – Use ripe bananas for the best natural sweetness and moisture.
Milk – Thins the batter slightly for an even texture.
Vegetable oil – Can be substituted with melted coconut oil.
Large eggs – Bind the ingredients and provide structure.
Vanilla extract – Enhances flavor.
Salt – Balances and enhances the overall taste.
How to make Oatmeal Bars
This Peanut Butter Banana Oatmeal Bars recipe comes together quickly with just a bowl and a spoon. Follow these straightforward steps for consistent results.
Step One: Preheat your oven to 400°F (204°C). Grease a 9×13-inch baking pan with nonstick spray or line it with parchment paper for easy removal.
Step Two: In a large bowl, whisk together the rolled oats, all-purpose flour, light brown sugar, and baking soda until evenly combined.
Step Three: Add the mashed banana, peanut butter, milk, vegetable oil, eggs, vanilla extract, and a pinch of salt to the dry ingredients. Stir until the batter is blended and uniform; it will be thicker than a cake batter but spreadable.
Once combined, the mixture will have a dense, slightly coarse texture from the oats.
Step Four: Spread the batter evenly into the prepared 9×13-inch pan, smoothing the top with a spatula.
Step Five: Bake for about 20 minutes, or until a toothpick inserted into the center comes out clean. Allow the pan to cool completely before slicing into bars. Store covered at room temperature for 2–3 days, or refrigerate in an airtight container for longer freshness. These bars also freeze well for extended storage.
Variations
Sweeteners – If you prefer a different sweetener, stir in a little raw honey or pure maple syrup to taste.
Add fruit – Dried fruit like raisins or cranberries adds chew and brightness that pairs well with oats and peanut butter.
Add chocolate – Fold in dark, milk, or white chocolate chips for a sweeter treat, or sprinkle chips on top before baking.
Make cookies – The batter is similar to an oatmeal cookie dough, so you can portion it into scoops and bake shorter for cookies instead.
Common Questions
Do I have to use natural peanut butter for this recipe?
You can use any peanut or other nut/seed butter you like. Natural creamy peanut butter works well, but almond butter, cashew butter, or sunflower seed butter are all good substitutes. Each will slightly change the flavor and texture, so feel free to experiment.
How do I store these bars?
After baking and slicing, store the bars in an airtight container in the refrigerator for the best freshness. They keep for several days chilled and can be enjoyed cold or warmed briefly in the microwave. For longer storage, freeze individually wrapped bars for easy grab-and-go portions.
Will these bars stick to the baking dish?
To prevent sticking, grease the pan or line it with parchment paper that extends up the sides. Lifting the bars out using the parchment makes cutting and serving much easier and cleaner.
📖 Recipe
Peanut Butter Banana Oatmeal Bars Recipe
Ingredients
- 1 ½ cups all-purpose flour
- 1 ½ cup rolled oats
- ½ cup light brown sugar
- 1 teaspoon baking soda
- ½ cup peanut butter
- ½ cup mashed banana
- ½ cup milk
- ½ cup vegetable oil
- 2 large eggs
- 1 teaspoon vanilla extract
- pinch salt
Instructions
-
Preheat the oven to 400 degrees. Grease a 9×13 pan with cooking spray.
-
Combine flour, oats, sugar, and baking soda in a large bowl.
-
Stir the peanut butter, banana, milk, oil, eggs, vanilla, and salt until the batter is just blended.
-
Spread in the prepared pan.
-
Bake in the preheated oven until a toothpick inserted in the center comes out clean, about 20 minutes.