Nelle's Chocolate Chess Pie

one of the best chocolate pies - should be called fudge pie!

1 1/2 c sugar
3 T (heaping) cocoa
add 1 stick melted butter, 2 eggs, slightly beaten, 5 oz can Pet milk
1 t vanilla
pour into unbaked pie crust. Bake at 45 minutes at 350 ) or longer, til center is set)