01 -
Cook the jumbo pasta shells according to package instructions until al dente. Drain and set aside.
02 -
In a bowl, mix together ricotta cheese, spinach, Parmesan cheese, Italian seasoning, salt, and pepper.
03 -
Stuff each pasta shell with the ricotta mixture and place them in the slow cooker.
04 -
Pour marinara sauce over the stuffed shells and sprinkle with mozzarella cheese.
05 -
Cover and cook on low for 4-5 hours or high for 2-3 hours, until heated through and the cheese is melted.
06 -
Serve hot, garnished with fresh basil if desired.