Heat 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.
In medium bowl, stir Bisquick mix, cornmeal and Parmesan cheese.
Cut in butter, using pastry blender or fork, 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 ⅓ cup of the pizza sauce.
Top with sausage and onion mixture.
Arrange two-thirds of the pepperoni over onion mixture.
Spread remaining ⅓ cup pizza sauce over pepperoni; top with shredded mozzarella cheese and remaining pepperoni.
Bake 30 to 35 minutes or until crust is golden brown.
Let stand 5 minutes.
Garnish with basil.
Serve with additional pizza sauce, heated, if desired.