Preheat oven to 350 degrees F and grease a deep 9x13 inch baking dish with cooking spray. Set aside.
Melt butter over medium heat in a large non-stick skillet.
Once melted, add in sausage, onion, garlic, salt, and pepper,
Cook, breaking up the meat as you go, until the onions are soft and the sausage is no longer pink.
Stir in the jar of pasta sauce, then pour the mixture into a large mixing bowl.
Stir in the cooked pasta.
Taste and re-season, if necessary.
Spread 1/2 of the rigatoni mixture evenly into the bottom of the prepared baking dish.
Layer with 1/2 of the provolone cheese slices.
Dollop then spread out 1/2 of the sour cream on top of the cheese.
Sprinkle with 1/2 of the mozzarella.
Repeat the layers.
Top with grated parmesan.
Bake in the preheated oven for 30-45 minutes, or until the cheeses are melted and the dish is heated through.
Serve and enjoy!
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