CRUST
2 cups flour
1/2 cup powdered sugar
1 cup margarine or butter
FILLING
4 eggs, slightly beaten
2 cups sugar
1/4 cup flour
1 teaspoon baking powder
1/4 cup lemon juice
lemon zest (optional)
FROSTING
1 cup powdered sugar
2-3 Tablespoons lemon juice
…
Heat oven to 350. Combine crust ingredients, mixing until crumbly (a food processor works well for this step). Press mixture evenly into the bottom of a 13×9 pan OR a half sheet pan, covered in parchment paper that has been sprayed with cooking spray. Bake for 20 to 30 minutes, until light golden brown.
In a large bowl, combine all filling ingredients and blend well. Pour mixture over warm crust.
Return to oven and bake an additional 20-30 minutes until the top is a light golden brown. Cool completely.
In a small bowl, combine 1 cup powdered sugar and enough lemon juice for desired spreading consistency. Blend until smooth. Spread over cooled bars.