Chewy blondies with brown sugar richness and vanilla warmth are the butterscotch cousin of brownies everyone loves. These golden, family-friendly bars are a simple, satisfying dessert.
Preheat oven to 350°F (175°C) and line a 9x13-inch baking pan with parchment paper, leaving an overhang for easy removal.
Melt the unsalted butter in a medium saucepan over low heat, then cool slightly to avoid cooking the eggs.
In a large bowl, whisk together melted butter and light brown sugar until smooth and glossy, ensuring the sugar fully dissolves for the best texture.
Beat in eggs and vanilla extract one at a time to maintain a creamy, unified mixture.
Combine all-purpose flour, baking powder, and salt in a separate bowl, then gently fold the dry ingredients into the wet mixture with a spatula—avoid overmixing to keep blondies tender.
Spread the batter evenly into the prepared pan and smooth the top; bake on the center rack for 22–25 minutes until the top is golden and set but the center is still slightly soft.
Cool completely in the pan on a wire rack before lifting out and slicing into bars for clean edges and optimal chewiness.