Begin by browning the ground beef in a skillet until fully cooked.
In a bowl, mix cream cheese, sour cream, and a portion of mozzarella cheese.
In your crock pot, layer cooked spaghetti, followed by the cream cheese mixture, and then the cooked ground beef.
Pour marinara sauce over the layers, ensuring even coverage.
Sprinkle a generous layer of mozzarella and Parmesan cheese on top.
Repeat the layering process once more: spaghetti, cream cheese mixture, ground beef, sauce, and cheese.
Set your crock pot to low heat and let the Million Dollar Spaghetti cook slowly for a few hours.