Nann Pettey's Yummy Brownies

2 sticks butter, melted
2 cups sugar
4 eggs
6 Tbsp cocoa
2 cups flour
1 tsp vanilla

Mix together and pour in greased 9 x 13 pan.
Sprinkle with chocolate chips.
Bake at 350 for 20 minunites.

(The secret is not to overbake.)