Add beans, corn, soup, milk, onion, chili powder and salt; bring to a boil.
Remove from the heat; stir in cheese until melted. Spoon into a greased 2-1/2-qt. baking dish. Bake, uncovered, at 375 degrees F for 10 minutes.
Meanwhile, brush all sides of biscuits with butter; roll in cornmeal.
Place on top of bubbling meat mixture. Return to the oven for 10-12 minutes or until biscuits are lightly browned and cooked through.