Heat the oven to 350 degrees F, and spray a 9 x 13-inch pan with nonstick cooking spray.
In a large bowl, stir together the angel food cake mix and lemon pie filling.
Once fully mixed, add to the prepared pan, and bake for about 35 minutes, until fully cooked and the top is lightly browned.
Let the cake cool, cut it into bars, and if desired, sprinkle with powdered sugar.
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