1Heat oven to 350°F. In 12-inch nonstick skillet, cook sausage over medium heat until no longer pink. Remove sausage to paper towels, reserving drippings. Cook onion and bell pepper in drippings until crisp-tender.
2In medium bowl, stir Bisquick mix, cornmeal and Parmesan cheese. Cut in butter, using pastry blender, until crumbly. Add boiling water; stir vigorously until dough forms. Spray 10-inch ovenproof skillet with cooking spray. Press dough on bottom and up side of skillet. Arrange cheese slices over crust; spread with 1/3 cup of the pizza sauce. Top with sausage and onion mixture. Arrange two-thirds of the pepperoni over onion mixture. Spread remaining 1/3 cup pizza sauce over pepperoni; top with shredded mozzarella cheese and remaining pepperoni.
3Bake 30 to 35 minutes or until crust is golden brown. Let stand 5 minutes. Garnish with basil. Cut into 8 wedges; serve with additional pizza sauce, heated, if desired.