Boterkoek (dutch buttercake)

Ingredients

2/3 cup margarine or butter
1 cup sugar
1 1/2 teaspoons vanilla extract
1 egg, beaten (reserve 1 tsp)
1 1/2 cups flour
1/2 teaspoon baking powder

vanilla can be substituted with almond extract.

In a medium bowl, mix together butter, sugar and vanilla extract.
Add beaten egg except for 1 teaspoon.
Sift flour and baking powder, and add to bowl, mixing with wet ingredients.
Put dough in greased 9 inch pie plate.
Mix the reserved 1 tsp of beaten egg with 1 tsp of water, and brush over dough.
Bake at 350°F for 25-30 minutes or until done (firm to the touch).
This is a dense cake, but should be soft on the inside and hard on the outside, but not too hard!