Incredible Lemon Squares - cooking recipe

Ingredients

1 cup butter (preferably) or 1 cup margarine, at room temperature
1/2 cup icing sugar, plus
1 tablespoon icing sugar
2 1/3 cups flour
4 eggs
1 3/4 cups sugar
1/3 cup fresh lemon juice
1/2 teaspoon baking powder

Preparation

Preheat oven to 350.
In medium bowl, cream butter and 1/2 cup icing sugar.
Add 2 cups flour and stir with wooden spoon until well combined.
Pat evenly into a 13 by 9 inch baking pan. Bake for 20 minutes.
Combine eggs, sugar, remaining 1/3 cup flour, lemon juice and baking powder in blender container; cover and blend for 5 seconds. Scrape down sides of blender and blend another 5 seconds.
Pour over partially baked crust and bake another 25 minutes or until light brown.
Cool completely on wire rack.
Sprinkle with remaining icing sugar.
Cut into 32 squares.