Step 1

Combine ricotta cheese, spinach, ½ cup mozzarella cheese, ¼ cup Parmesan cheese, eggs, and seasonings in a small bowl. Spoon or pipe mixture into raw pasta shells.

Step 2

Place ½ cup sauce in the bottom of a 6-quart slow cooker. Line the bottom with stuffed shells and top with 1 cup of pasta sauce. Layer on the rest of the shells, then top with the rest of the sauce.

Step 3

Sprinkle with remaining mozzarella cheese, cover, and cook on high for 3-4 hours or on low 5-6 hours. Remove lid, sprinkle with remaining Parmesan, serve garnished with parsley, if desired.