Step 1

Add jumbo pasta shells to a large pot of boiling salted water. Cook until they just become soft. You want them to be undercooked because they will cook more in the slow cooker. Drain and set aside.

Step 2

Add ricotta cheese, spinach, 1 ½ cups mozzarella cheese and egg to a large bowl and stir to combine.

Step 3

Spoon the ricotta mixture into the shells.

Step 4

Spread a thin layer of pasta sauce on the bottom of the slow cooker.

Step 5

Place the stuffed shells into the slow cooker. You can stack them to fit them all in.

Step 6

Spread the cooked sausage over the shells.

Step 7

Spread the remaining pasta sauce over the sausage.

Step 8

Cook on LOW for 3 to 4 hours until hot and bubbly.

Step 9

In the last 30 minutes of cooking, spread the remaining mozzarella cheese on top.

Step 10

Top with Parmesan and parsley and serve.