1.In A Skillet, Cook Beef Over Medium Heat Until No Longer Pink; Drain. Stir In The Chili Powder, Salt And Pepper. Remove From The Heat And Set Aside. 2.Combine Biscuit Mix And Water To Form A Soft Dough. Press Onto The Bottom And Up The Sides Of Two 10-Oz. Ramekins Or Custard Cups Coated With Nonstick Cooking Spray. Fill With Meat Mixture; Top With Tomato And Green Pepper. Combine The Sour Cream, Mayonnaise, Cheese And Onion; Spread Evenly Over Top. Bake, Uncovered, At 375 Degrees F For 20-25 Minutes Or Until Heated Through.