Heat a non-stick pan over medium heat.
Once hot, add in sausage, onion, garlic, salt, and pepper.
Cook, breaking up the meat as you go, until the sausage is no longer pink and the onions are tender.
Stir in the pasta sauce, then taste and re-season, if necessary.
Grease a 6 quart crockpot with cooking spray, then spoon in 1/3rd of the sauce mixture.
Top with 1/2 the frozen ravioli, 1/2 the sour cream, 1/2 the provolone cheese slices, 1/2 the mozzarella, and 1/2 the parmesan cheese.
Next, layer on 1/3rd sauce, remaining ravioli, and remaining sour cream.
Then layer on remaining sauce and cheeses.
Cover and cook on LOW for 3 hours.
Serve and enjoy!
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