Heat oven to 375°F. In 12-inch nonstick skillet, cook beef and onions over medium-high heat, stirring frequently, until beef is thoroughly cooked. Drain.
Stir in bell pepper, mushrooms, chili powder, beans, pizza sauce and soup. Cook about 5 minutes, stirring occasionally, until mixture comes to a simmer. Spoon hot mixture into ungreased 2 1/2-quart casserole.
Separate dough into 5 biscuits. Cut each in half crosswise; place, cut side down, around edge of hot mixture. Sprinkle with cheese.
Bake 15 to 20 minutes or until biscuits are golden brown and no longer doughy on bottom.