Packed light brown sugar
8 tbsp(s), cold, cut into 1/2-inch pieces
Powdered sugar (icing sugar)
1½ cup(s), divided
Fresh lemon juice
- Preheat oven to 350°F.
- To make crust, mix flour and light brown sugar using a food processor until fully incorporated. Toss butter into flour mixture and pulse to combine using short bursts of power until butter is cut into tiny pea-sized pieces and dough appears lumpy. Sprinkle crust mixture onto an ungreased 13 X 9 X 2-inch baking pan as evenly as possible; press down with a spatula to create a packed surface. Place crust in middle of oven and bake until golden, about 20 minutes.
- Meanwhile, to make lemon topping, beat eggs in a medium bowl with an electric mixer until well blended. Add vanilla extract and 3/4 cup of powdered sugar; mix well. Add lemon juice and remaining powdered sugar; mix until powdered sugar is completely dissolved and then add zest.
- As soon as crust is finished, remove from oven and reduce oven temperature to 300°F. Immediately pour lemon mixture over hot crust. Bake completely, about 30 minutes; cool, and cut into 24 bars. Yields 1 bar per serving.