Stir together baking mix, baking powder, and salt in a large bowl. Stir in milk and remaining ingredients, stirring just until dry ingredients are moistened. Spoon cheese mixture into a lightly greased 15- x 10-inch jelly-roll pan.
Bake at 350 for 30 minutes or until golden brown and set.
Remove from oven, and let cool on a wire rack 10 minutes.
Cut into 1 1/2-inch squares, and serve immediately.
Note: For testing purposes only, we used Bisquick All-Purpose Baking
