Brown beef in skillet, drain. Add seasoning mix and water. Cook over low heat for about 5 minutes or until thickened.
Turn heat off and add beans and 3/4 cup cheese. Mix well.
Spread 1/2 cup salsa into the bottom of a greased 9X13 pan. Fill pasta shells with the beef and bean mixture. Place shells in dish, filled side up. Spoon the remaining salsa over the shells.
Cover with foil and bake for about 30 minutes. Sprinkle with the remaining cheese and bake uncovered for about 10-15 more minutes.