Step 1

Preheat oven to 350°F (177°C). Line an 8-inch baking pan with aluminum foil, leaving an overhang on the sides to lift the finished blondies out. (Or spray generously with nonstick spray.)

Step 2

Mix together flour, baking powder, baking soda, and salt. Set aside. In a separate bowl, whisk the melted butter, brown sugar, and vanilla together until combined. Add egg and mix well. Slowly add in the dry ingredients and stir together until *just* combined. Fold in the chopped candy bars. The batter will be very thick. Spread evenly into prepared baking pan.

Step 3

Bake for 24-26 minutes or until lightly browned on top. Remove from the oven and allow to cool completely before cutting into squares. Blondies stay fresh covered at room temperature for up to 1 week.