Pepperoni-Sausage Stuffed Pizza

Ingredients (18)

• 1 package (1/4 ounce) active dry yeast
• 1-1/4 cups warm water (110° to 115°)
• 2 tablespoons olive oil
• 1-1/2 teaspoons salt
• 1 teaspoon sugar
• 3-1/2 to 4 cups all-purpose flour
• FILLING:
• 2-1/2 cups shredded part-skim mozzarella cheese, divided
• 2-1/2 cups shredded white cheddar cheese, divided
• 2 tablespoons all-purpose flour
• 2 teaspoons dried oregano
• 2 teaspoons dried basil
• 1/2 teaspoon crushed red pepper flakes
• 1 pound bulk Italian sausage, cooked and crumbled
• 1/2 pound sliced fresh mushrooms
• 1 package (3-1/2 ounces) sliced pepperoni
• 1 can (15 ounces) pizza sauce
• Grated Parmesan cheese, optional