In a Dutch oven or soup kettle, over medium heat, cook beef, onion and green pepper until meat is no longer pink; drain. Add remaining ingredients; bring to a boil, stirring occasionally. Reduce heat; cover and simmer for 10 minutes. Meanwhile, combine flour, cornmeal, baking powder and salt in a bowl. Beat egg, milk and sour cream until smooth; stir into dry ingredients just until moistened. Transfer chili to an ungreased 13-in. x 9-in. baking dish. Drop batter by heaping teaspoonfuls onto hot chili. Bake, uncovered, at 400° for 15-17 minutes or until biscuits are lightly browned.