# What You’ll Need:
→ Blondie Base
01 - 1/2 cup unsalted butter, melted and slightly cooled
02 - 3/4 cup packed light brown sugar
03 - 1/4 cup granulated sugar
04 - 1 large egg
05 - 1 1/2 teaspoons pure vanilla extract
06 - Zest of 1 lemon
07 - 2 tablespoons fresh lemon juice
08 - 1 1/2 cups all-purpose flour
09 - 1/2 teaspoon baking powder
10 - 1/4 teaspoon fine sea salt
→ Mix-ins
11 - 1/2 cup white chocolate chips or chopped white chocolate
12 - 3/4 cup fresh blueberries, plus a few extra for topping
# How to Make It:
01 - Preheat oven to 350°F. Line an 8-inch square baking pan with parchment paper, leaving an overhang for easy removal and set aside.
02 - In a large bowl, whisk the melted butter with the brown sugar and granulated sugar until fully incorporated and smooth.
03 - Whisk in the egg, vanilla extract, lemon zest and lemon juice until the mixture is homogenous and glossy.
04 - In a separate bowl, whisk together the all-purpose flour, baking powder and fine sea salt to aerate and combine.
05 - Fold the dry ingredients into the wet mixture with a spatula, stirring only until no streaks of flour remain; avoid overmixing to keep the texture tender.
06 - Gently fold in the white chocolate chips and 3/4 cup blueberries, reserving a few berries and chips to scatter on top.
07 - Spread the batter evenly into the prepared pan, top with reserved blueberries and chips if desired, and bake 28–32 minutes until the center is just set and the edges are lightly golden.
08 - Allow the bars to cool completely in the pan on a rack, then lift out using the parchment overhang and cut into 12 even pieces.
