COOK and stir onions and garlic in hot oil in large saucepan on medium-high heat until tender.
ADD ricotta cheese, milk and Parmesan cheese; mix well. Cook 2 min., stirring occasionally. Add spinach; mix well. Reduce heat to medium-low; cook until heated through, stirring occasionally. Stir in tomatoes and pepper.
SERVE tossed with hot cooked fettuccine or your favorite pasta.