Serves 3

8 to 10 ounces medium-sized pasta (rotini, penne, etc.)
1/2 tablespoon olive oil
8 ounces button mushrooms, cut into quarters
1 medium green bell pepper, cut into bite-sized pieces
3/4 medium onion, cut into bite-sized pieces
1 to 1-1/2 cups prepared pasta sauce
1/4 to 1/2 cup grated parmesan
Kosher salt
Freshly ground black pepper