Brookie Brownie Layer

This is going to be the base layer for some three-layer, delicious chocolaty bars I will be making. This is a simple, sweet decadent brownie layer. It could be made on its own as well, and frosted as desired for brownies. 

Brookie Brownie Layer
4 large eggs, beaten
1 1/4 cups unsweetened cocoa powder
1 Tablespoon vanilla extract
1 teaspoon baking powder
1 teaspoon salt
1 cup butter or hard margarine, melted
2 1/4 cups granulated (white) sugar
1 1/2 cups all-purpose (plain) flour

Preheat oven to 350◦F. Line a 9x13 inch rectangular baking pan with foil.
In a large bowl, beat together the eggs and cocoa. Beat in the vanilla, baking powder, and salt. Stir together the butter and sugar, then add to mixture. Stir in the flour.
Spread batter evenly in prepared pan and bake for about ten minutes if making brookies or approximately 30-40 minutes if just making brownies. Brownies should be just set and beginning to pull away from the sides of the pan. A toothpick inserted in the center should come out with fudgey, moist crumbs attached.