Heat oven to 400° F. Cook meat and onion, stirring frequently, until beef is brown; drain.
Stir in water, tomato sauce and dry sauce mix; stir in beans.
Heat to boiling, stirring constantly; reduce heat. Simmer, uncovered, about 5 minutes, stirring occasionally, until mixture is thick.
Pour into ungreased 9x9x2" pan. Top with cheese slices.
Mix baking mix and milk until soft dough forms; beat 30 seconds.
Drop by 6 Tbsp onto cheese slices; sprinkle with Parmesan.
Servings: 6