In large skillet over medium-high heat, brown sausage, breaking apart, until cooked through.
Mix in spinach; continue cooking 2 to 3 minutes, until wilted.
Reduce heat to medium-low. Stir in tomato basil sauce and ravioli. Cover; continue cooking 5 to 8 minutes, until ravioli is heated through.
Sprinkle with mozzarella cheese. To melt cheese, cover 2 to 3 minutes.
Tip: If you prefer golden brown cheese on top, use an oven safe skillet. Once cheese is added, place under the broiler for 2-4 minutes to melt and brown the cheese.
