Step 1: Heat your skillet and add the ground beef, Italian sausage, diced onion, and garlic. Cook until the meat is browned. Drain off any excess grease.
Step 2: Add diced tomatoes and tomato sauce to the skillet and mix.
Step 3: Transfer half the sauce to the bottom of your slow cooker, then add a single layer of frozen ravioli and some shredded cheese.
Step 4: Add another layer of sauce followed by the rest of the ravioli and the last of the shredded cheese. Close the lid on this delicious meal and let the Crockpot do its job. Once the ravioli casserole is finished, let it sit, and sprinkle with grated parmesan cheese, and garnish with fresh basil.