Philly Cheese Steak Pizza

1 pre-baked pizza crust
1 medium onion, thinly sliced and separated into rings
1 small bell pepper, cut into 1/8-inch strips
2 garlic cloves, minced
1 tablespoon oil
½ pound thinly sliced deli roast beef, cut into ¼ inch strips
6 mushrooms, sliced
1 teaspoon oregano
1 teaspoon basil
¼ teaspoon salt
¼ teaspoon pepper
1 cup shredded mozzarella cheese
½ cup shredded Parmesan cheese

Place crust on pizza pan and set aside. In a skillet, sauté onion, bell pepper, and garlic in oil for 3 to 5 minutes. Add beef and mushrooms; cook until heated through. Drain. Stir in seasonings. Spread meat mixture over crust to within ½ inch of edge. Combine cheeses and sprinkle over pizza. Bake at 350* for 15 minutes or until cheese is melted.