Easy Slow Cooker Stuffed Shells With Ground Beef

Cook the pasta in boiling salted water following the package directions, just until tender and still firm; drain and set aside. Featured Video While the pasta is cooking, heat the olive oil in a large skillet. When the skillet is hot, add the ground beef making sure to break it up into smaller chunks with a spatula or wooden spoon as it cooks. Add the onion to the skillet and continue to cook until the beef is no longer pink. Add the garlic and cook for about 1 minute longer; drain mixture well. Remove the skillet from the heat and add the mozzarella cheese, bread crumbs, parsley, and egg. Mix together thoroughly. Stuff the meat and cheese mixture into the drained pasta shells set aside. Pour about half of the spaghetti sauce or marinara into the slow cooker insert. Arrange stuffed shells in the sauce. Spoon the remaining sauce over the stuffed shells and then sprinkle with Parmesan cheese. Cover the pot and cook on low for 5 to 6 hours.