Brittany's Best Brownies

1 cup butter
1/2 cup cocoa powder
2 cups flour
1 tsp baking powder
1/4 tsp salt
4 eggs
2 cups sugar
2 tsp vanilla

Melt butter in sauce pan. Remove from heat and stir in cocoa and sugar until well blended. Add eggs and stir just until blended. Do not over stir. Sift flour, baking powder, and salt together. Add to cocoa mixture and stir well. Stir in vanilla. Pour into buttered 9x13 pan. Bake at 350 for 20-25 minutes or until edges look firm.