Heat oven to 425. In skillet, brown hamburger over med. high heat 5 to 7 min. stirring occasionally until done, drain. Stir in seasoning mix, salsa into beef. Heat to boiling, stirring occasionally. Pour into ungreased 8 inch square pan. Meanwhile, in med. bowl, stir bisquick mix, cheese and milk until soft dough forms. Drop dough by 12 spoonfuls onto beef mixture. Bake uncovered 20 to 25 min.