Easy Fudge Pie

unbaked pie shell - not deep dish
1 stick (1/2 cup) butter or margarine, melted
1/4 cup cocoa (this is the dry, unsweetened powder used for baking, etc.)
1/4 cup plain flour
1 cup sugar
1/4 teaspoon vanilla
2 eggs

Preheat oven to 350 degrees.
Mix dry ingredients together.
Add eggs and stir.
Add melted butter and vanilla and stir well.
Pour into pie shell and bake for 35 minutes.
Serve warm or at room temp.
Top with whipped cream or vanilla ice cream if desired.
(I have tripled the recipe - 3 pies at a time is all my oven can do well. For that you need a LARGE bowl, like what you use for the electric mixer.)