Banana Peanut Butter Oat Bars with Baked Banana

Banana Peanut Butter Oat Bars

These baked bars are mildly sweet and moist, with visible oat flakes and two banana rounds on every piece. They’re cut from an 8-inch square pan into 12 hand-held portions.

Grinding half the oats helps the banana and peanut butter batter hold together; leaving the rest whole gives the bars their rustic texture. Let the slab cool before cutting so the edges stay intact.

Ingredients for Banana Peanut Butter Oat Bars

• 2 medium very ripe bananas, mashed (about 1 cup or 225g)
• 1 medium banana, for topping (about 110g)
• 1/2 cup creamy peanut butter, well stirred (about 130g), divided
• 2 cups old-fashioned rolled oats (180g), divided
• 1 large egg
• 2 tablespoons maple syrup (40g)
• 1 teaspoon vanilla extract
• 1/2 teaspoon baking powder
• 1/4 teaspoon fine salt

Yield: 12 bars. Prep: About 15 minutes. Bake: About 25–32 minutes. Total: About 80–90 minutes, including cooling.

How to Bake Banana Peanut Butter Oat Bars

1. Preheat and line the pan: Heat the oven to 350°F (175°C). Line an 8-inch square baking pan with parchment, leaving an overhang on two sides.
2. Prepare the oats: Grind 1 cup of the rolled oats in a food processor or blender until they resemble coarse flour. Mix with the remaining 1 cup whole oats, baking powder, and salt.
3. Mix the batter: In a second bowl, mash the 2 batter bananas. Stir in 6 tablespoons of the peanut butter, the egg, maple syrup, and vanilla. Fold in the oat mixture until no dry pockets remain. The batter should be thick and spreadable, not pourable. If unusually large bananas or runny peanut butter make it pourable, fold in a small spoonful of additional ground oats.
4. Add the topping: Spread the batter evenly in the pan. Stir the reserved 2 tablespoons peanut butter until smooth, then dot and lightly swirl it over the surface. Cut the topping banana into about 24 rounds. Arrange them in pairs within an imagined 3-by-4 grid, with two rounds inside each future bar. Press lightly so they adhere without sinking into the batter.
5. Bake: Bake uncovered for about 25–32 minutes, checking the center at 25 minutes. The edges should be lightly browned and the center set, not shiny with raw batter. A toothpick inserted into batter away from the banana rounds should come out without wet batter; a few moist crumbs are fine. If the top browns before the center sets, loosely tent it with foil while it finishes baking.
6. Cool and cut: Cool in the pan for about 20 minutes. Lift out by the parchment and cool another 20–30 minutes, until firm enough to cut cleanly. Cut into a 3-by-4 grid between the banana pairs.

Why Grind Only Half the Oats?

The ground oats help bind the moist batter, while whole rolled oats remain visible on the tops and cut edges. Old-fashioned oats work best for that distinct flake texture; quick oats will make the bars less rustic.

How to Tell When the Bars Are Done

Check the batter between the banana rounds rather than judging by the fruit’s glossy surface. The center should be set, and the edges should begin to pull from the parchment. Banana size, peanut butter consistency, and oven behavior can shift the bake time, so use those cues rather than the clock alone.

Serving and Variations

Serve the cooled bars by hand for breakfast or a snack, with fruit or yogurt alongside if desired. For a cinnamon variation, add 1/2 teaspoon ground cinnamon to the dry ingredients. For a sweeter version, fold up to 1/4 cup mini chocolate chips into the batter, keeping the banana rounds visible.

For another oat-bar option, see these homemade granola bars.

How to Store the Bars

Cool completely, then refrigerate in a covered container. Separate layers with parchment to keep the banana topping from sticking. The bars can be made ahead and served cool or allowed to come closer to room temperature.

Nutrition

Approximate per bar (1 of 12): 160 calories, 6g protein, 7g fat, and 21g carbohydrates. Approximate per 100g of baked bars: 285 calories, 11g protein, 12g fat, and 37g carbohydrates. Values are estimates; banana size, peanut butter, and moisture lost during baking will affect them.