If you adore the warm, cozy flavor of banana bread but crave the dense, fudgy bite of a blondie, these banana bread blondies bridge the best of both worlds. Soft and richly flavored, they come together in one bowl and finish with a glossy brown butter frosting that turns a simple bar into a crowd-pleasing treat.
Why these banana blondies are different — and worth baking
These bars lean into the caramel-like sweetness of brown sugar and the familiar spice of cinnamon. They are not cake-like. Instead, they deliver a thick, moist texture closer to classic blondies, with banana folded into the batter for extra depth.
Short prep, big payoff: the recipe is straightforward, uses everyday pantry items, and bakes in under an hour. Add the brown butter glaze if you want a dessert that looks and tastes special.
Ingredients for moist banana blondies (one-bowl)
For the blondie batter
- ½ cup unsalted butter, melted
- 1 cup light brown sugar
- 1 large egg
- 2 teaspoons vanilla extract
- 1 to 1½ teaspoons ground cinnamon, to taste
- ¼ teaspoon salt
- 1 cup all-purpose flour
- ½ cup mashed ripe banana (about one medium-large banana)
For the brown butter frosting
- ¼ cup unsalted butter
- 6 tablespoons light brown sugar
- 2 tablespoons milk
- Pinch of salt
- 1 teaspoon vanilla extract
- 1 cup powdered sugar
Tip: Use very ripe bananas for best flavor and sweetness.
Step-by-step: bake banana bread blondie bars
- Preheat the oven to 350°F (175°C). Line an 8 x 8 inch pan with foil, leaving an overhang, and spray with cooking spray.
- In a medium bowl whisk together melted butter and light brown sugar until smooth.
- Add the egg, vanilla, cinnamon, and salt. Whisk until combined, then fold in the mashed banana.
- Stir in the flour just until the batter is smooth and uniform. Do not overmix.
- Spread the batter evenly in the prepared pan and smooth the top with a spatula.
- Bake 25–30 minutes, until the center is set and the edges pull slightly from the pan.
- Remove from the oven and cool to room temperature before glazing.
Pro tip: Use the foil overhang to lift the cooled blondies from the pan for easier slicing.
How to make the brown butter frosting that steals the show
- In a small saucepan, melt the ¼ cup butter over medium heat.
- Continue cooking, stirring constantly, until the butter turns a light amber and smells nutty. Watch closely to avoid burning.
- Remove from heat. Stir in the brown sugar, milk, and a pinch of salt. Bring briefly to a simmer, then let cool 10–15 minutes.
- Whisk in the vanilla and sifted powdered sugar until smooth. The glaze should be pourable but thick enough to coat the back of a spoon.
- Spread over cooled blondies and allow the frosting to set before cutting.
Timing, servings and quick facts
- Prep time: about 15 minutes
- Cook time: 25–30 minutes
- Total time: roughly 45 minutes
- Yield: 16 squares from an 8 x 8 pan
- Category: Dessert; also great as a treat for breakfast or a lunchbox snack
- Method: Oven baking
Serving ideas and easy variations to try
- Leave off the glaze for a less sweet snack that still highlights banana and brown sugar.
- Fold in ½ cup chocolate chips, chopped walnuts, or pecans for texture.
- Use half whole-wheat flour for a nuttier note. Expect a slightly firmer crumb.
- Swap coconut oil for butter for a dairy-free version. Skip the frosting or use non-dairy milk.
- Store cooled bars in an airtight container at room temperature for 2 days, or refrigerate up to a week. Freeze cut squares for longer storage.
More banana desserts to explore
- Banana bread cheesecake — a layered mashup of creamy cheesecake and moist banana bread, often studded with chocolate chips.
- Banana upside-down cake — caramelized fruit on top of tender cake, great for brunch or dessert.
- Try mashed banana in pancakes or muffins to use up ripe fruit.
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Health advocate and wellness researcher, Dr. Monroe brings clarity to confusing health trends with science-backed advice. Her mission is to help readers live vibrantly, from the inside out.