Brown sausage in a large skillet over medium heat, stirring to crumble. Drain, reserving 2 tablespoons drippings. Set aside.
Arrange apple rings in bottom of a greased 9-inch pie plate; sprinkle one-third of sausage over apples. Set aside.
Combine flour, cornmeal, sugar, baking powder, and salt in a medium mixing bowl. Combine milk, egg, and reserved drippings; stir into dry ingredients, mixing well. Stir in remaining sausage. Pour cornbread mixture into prepared pie plate
Bake at 425° for 30 minutes or until cornbread is golden brown. Remove from oven, and immediately invert pie plate onto a serving dish. Cut cornbread into wedges, and serve with warm applesauce, if desired.