Spinach Stuffed Shells

Ingredients

• 10 ounces baby spinach (about 10 cups), or 1 (10-ounce) package frozen chopped spinach
• 3 cloves garlic
• 12 ounces low-moisture whole-milk or part-skim mozzarella cheese, shredded (about 3 cups)
• 1 ounce Parmesan cheese, finely grated (about 1/2 firmly packed cup grated on a Microplane or 1/3 cup store-bought)
• 3 tablespoons olive oil, divided
• 1/4 teaspoon red pepper flakes
• 3/4 teaspoon kosher salt, divided, plus more for the pasta water
• 6 ounces dried jumbo pasta shells (about 20)
• 1 (15- to 16-ounce) container whole-milk ricotta cheese (about 2 heaping cups)
• 1/4 teaspoon freshly ground black pepper
• 1 (about 24-ounce) jar marinara sauce (3 cups), divided

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