Preheat oven to 450°.
Remove casings from sausage. Heat a large nonstick skillet over medium heat. Coat pan with cooking spray. Add sausage and bell peppers to pan; cook 6 minutes or until bell peppers are crisp-tender and sausage is browned, stirring frequently.
Place pizza crust on a large baking sheet. Combine Basic Marinara and tomato paste, stirring with a whisk; spread evenly over crust, leaving a 1-inch border. Sprinkle with cheeses and oregano; top evenly with sausage mixture. Bake at 450° for 15 minutes or until cheese melts and crust is lightly browned. Remove from oven; let stand 5 minutes before slicing.