Batman Cake

1 box light brown sugar
½ cup sugar
4 eggs, beaten
2 sticks melted margarine
1 tablespoon Vanilla
2 cups self-rising flour
1 cup chopped Pecans

Mix all ingredients well. Grease and flour 9x13 pan. Bake at 350° for 20 minutes. Remove pan and shake cake or rap on counter so it will fall. Return to oven and bake another 20 minutes. Cool. Cover with confectioner's sugar then cut into small squares.