21 jumbo pasta shells, cooked according to package directions
Garnish: grated fresh Parmesan
Instructions
Preheat oven to 350°. Spray a 12-inch cast-iron skillet with cooking spray.
In a large bowl, stir together spinach, ricotta, Parmesan, egg, lemon zest, garlic, salt, and pepper.
Spread 1 cup marinara in bottom of prepared pan. Divide spinach mixture evenly among pasta shells, and place in prepared pan. Pour remaining marinara sauce onto shells. Spray a piece of foil with cooking spray; cover pan, spray side down.
Bake for 30 minutes. Uncover and bake until hot and bubbly, about 10 minutes more. Let stand for 5 minutes before serving. Garnish with Parmesan, if desired.
Recipe by Southern Cast Iron at https://southerncastiron.com/ricotta-parmesan-spinach-stuffed-shells/