add olive oil to skillet

sautee onions and garlic, over medium heat

add sausage and cook until brown

add tomatoes, tomatoe sauce, chicken broth and ravioli

bring mixture to a boil, then reduce heat and simmer

cook until ravioli are tender and sauce has reduced and thickened, about 15-20 min

remove from heat, stir in mozzarella and parmesan