1In large bowl, stir Bisquick mix, water and oil until soft dough forms; beat vigorously 20 strokes. Let stand 8 minutes.
2Move oven rack to lowest position. Heat oven to 450°F. Grease 12-inch pizza pan with shortening or cooking spray. Press dough on bottom and 1 inch over side of pizza pan. Place string cheese along edge of dough. Fold 1 inch edge of dough over and around cheese; press to seal. Bake 7 minutes.
3Spread tomato paste over crust. Top with onion, bell pepper, mushrooms, pepperoni and olives. Sprinkle with mozzarella cheese. Bake 8 to 10 minutes or until crust is golden brown and cheese is melted.