Chewy, ultra-moist banana blondies packed with caramel-y brown sugar flavor. Easy one-bowl batter, pantry staples, and optional mix-ins for a bakery-style bar everyone will love.
Preheat oven to 350°F. Line an 8x8-inch pan with parchment paper, leaving overhang, and lightly grease.
In a large bowl, whisk melted butter and brown sugar until smooth and glossy.
Whisk in the egg and vanilla until fully combined.
Stir in the mashed bananas until evenly incorporated.
In a separate bowl, whisk flour, baking powder, baking soda, salt, and cinnamon.
Fold dry ingredients into the banana mixture just until no dry streaks remain. Do not overmix.
Fold in walnuts and white chocolate chips, if using.
Spread batter evenly into the prepared pan and smooth the top.
Bake 22 to 28 minutes, until edges are set and a toothpick inserted near the center comes out with moist crumbs (not wet batter).
Cool completely in the pan on a rack. Lift out using parchment and cut into 16 bars.
Notes
For extra banana flavor, use very ripe bananas with plenty of brown spots. Swap walnuts for pecans, or skip nuts for a nut-free version. Store airtight at room temperature up to 3 days or refrigerate up to 5 days; blondies also freeze well up to 2 months.