Hamburger Cornbread Casserole

1 pound lean ground beef (90% lean)
1 small onion, chopped
1 can (15 ounces) Ranch Style beans (pinto beans in seasoned tomato sauce)
1 can (14-1/2 ounces) diced tomatoes, undrained
1 teaspoon chili powder
1 teaspoon Worcestershire sauce

TOPPING:
1/2 cup all-purpose flour
1/2 cup cornmeal
2 tablespoons sugar
2 teaspoons baking powder
1/4 teaspoon salt
1 egg, beaten
1/2 cup fat-free milk
1 tablespoon canola oil

In a large skillet, cook beef and onion over medium heat until meat is no longer pink; drain. Add the beans, tomatoes, chili powder and Worcestershire sauce; bring to a boil. Reduce heat; simmer, uncovered, for 5 minutes.
Transfer to an 11-in. x 7-in. baking dish coated with cooking spray. For topping, in a small bowl, combine the flour, cornmeal, sugar, baking powder and salt. Combine the egg, milk and oil; stir into dry ingredients just until moistened. Spoon over filling; gently spread to cover the top.
Bake, uncovered, at 425° for 14-18 minutes or until filling is bubbly and a toothpick inserted into topping comes out clean. Let stand for 5 minutes before cutting

Source: Taste Of Home