In a medium skillet, heat the 1 teaspoon vegetable oil over medium heat. Add the 12 ounces fresh baby spinach* to the skillet and toss with tongs until fully wilted.
In a medium mixing bowl, combine the drained 1 1/2 cups ricotta cheese, 1/4 cup roasted red peppers, cooked spinach, freshly grated 1/2 cup parmesan cheese, 2 eggs and 1 teaspoon fine sea salt. Mix well.
Stuff the mixture into al dente cooked 20 jumbo shells, placing snuggly into a baking dish.
Top with the 2 cups marinara sauce and shredded 1 cup mozzarella cheese.
Bake, uncovered, for 15-20 minutes or until the shells are fully heated.
Remove and top with minced parsley and additional Parmesan cheese.
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Notes
*You can use frozen, but make sure it is thawed and thoroughly drained of water.
Make ahead: Assemble, cover tightly and refrigerate up to 24 hours.
Storage: Store any leftovers in an airtight container in the refrigerator for 3-4 days. Add a splash of water or sauce when reheating.
Freezing: You can freeze stuffed shells either baked or unbaked. Make sure to wrap well and it will last for 2-3 months. Thaw overnight before baking.