Compliments of Better Homes & Gardens
Preheat oven to 325 degrees F. Line an 8-inch square baking pan with parchment paper. In a medium bowl stir together first five ingredients (through salt).
In a large bowl combine next four ingredients (through vanilla). Stir in flour mixture just until combined. Stir in chocolate. Spread batter in prepared pan.
Bake 25 to 30 minutes or until top is puffed and appears dry. Cool in pan on a wire rack. If desired, dust with additional cocoa powder.