4 eggs
1/2 cup butter or margarine, softened
1 1/2 cups white sugar
1 cup packed light brown sugar
3 tablespoons all-purpose flour
Preheat oven to 375 degrees F (190 degrees C). Grease and flour a 9-inch square pan.
Beat together the eggs, butter or margarine, white sugar, brown sugar, and flour until thoroughly combined.
Pour mixture into the prepared pan. Bake in preheated oven for 40 minutes, or until a toothpick inserted into the center of the pie comes out clean. Check frequently to see that the center is still warm.