Grease a 13 x 9-inch pan or a 12 inch pizza pan. Preheat oven to 350 °F. In a large mixing bowl, using only a spoon, beat melted butter, sugar, vanilla extract and eggs. Stir in dry ingredients until well blended. Spread into pan. Bake for 20 to 22 minutes or until top springs back when touched lightly. Serve plain or sprinkle hot brownie with chocolate or white chips, peanut butter chips, coconut or toffee bits.