Cook sausage and onion in a large saucepan over medium-high heat 8 to 10 minutes or until thoroughly cooked, stirring frequently; drain. Stir in salt and pepper. Spoon sausage mixture into a lightly greased, 9-inch glass pie plate.
Combine milk, baking mix and eggs in a medium bowl and blend with a wire whisk. Pour batter over sausage in pie plate.
Bake 25 minutes or until knife inserted in center comes out clean. Remove from oven. Top with sliced tomato and sprinkle with cheese. Bake an additional 5 minutes or until cheese is melted.
Let stand minutes before serving.
This recipe was created in partnership with Jimmy Dean brand for the Family Table program.