Heat oven to 350°F with the rack in the middle. Grease a 13x9x2 baking pan.
Melt butter on the stove top or in the microwave.
Combine the melted butter in a medium bowl with the sugar and vanilla.
Add the eggs, incorporate well. Add the cocoa, mix well. add the flour, baking powder and salt. Combine well.
Pour the batter into the prepared pan.
Bake 30-35 minutes or until center is not jiggly and the sides pull away from the pan.
Cool brownies completly in the pan on a wire rack. Cut brownies into the size you want them and layer on the Super Sexy Chocolate Frosting & more candy corn.