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Heat oven to 375°F. Lightly spray 12-inch pizza pan with cooking spray.
3 cups Original Bisquick® mix
2/3 cup very hot water
In large bowl, stir Bisquick mix and hot water with fork until soft dough forms; beat vigorously 20 strokes. Divide dough in half. Press half of the dough in pizza pan, using fingers dipped in Bisquick mix; pinch edge to form 1/2-inch rim.
1 package (12 oz) bulk pork sausage
In 10-inch skillet, cook sausage over medium heat, stirring frequently, until no longer pink; drain well on paper towels.
1 jar (14 oz) pizza sauce
1 package (3.5 oz) small pepperoni slices
1 jar (4.5 oz) Green Giant® sliced mushrooms, drained
1 medium green bell pepper, cut into 1/4-inch-thick rings, if desired
1/2 cup chopped onion (1 medium), if desired
8 slices (3/4 to 1 oz each) mozzarella cheese
2 tablespoons grated Parmesan cheese
Layer sausage and pepperoni on dough. With back of spoon, carefully spread 1/2 cup of the pizza sauce evenly over pepperoni. Top with mushrooms, bell pepper, onion and slices of mozzarella cheese.
Fold second half of dough in half; place over mozzarella cheese, and unfold. Press edge to seal. Cut several slits in top crust for steam to escape. Sprinkle Parmesan cheese over top.
Bake 35 to 40 minutes or until crust is deep golden brown. Meanwhile, heat remaining pizza sauce. Cut pizza into wedges; serve topped with warm pizza sauce.