01 -
Heat the oven to 350°F. Lightly grease a 9x13-inch baking pan and line it with parchment paper, leaving overhang on two sides.
02 -
In a large bowl, stir the dry angel food cake mix, lemon pie filling, and lemon zest until combined and foamy. Do not add the water listed on the cake mix box.
03 -
Spread the batter evenly into the prepared pan with a spatula, nudging it into the corners without pressing out too much air.
04 -
Bake for 25-30 minutes, until puffed, lightly golden, and springy in the center. A toothpick should come out without wet batter.
05 -
Cool completely in the pan for at least 1 hour. Lift out with the parchment, dust with powdered sugar, and slice into squares.