Mashed Potato Stuffed Shells

Ingredients

• 1 (12-ounce) box jumbo pasta shells
• 1 1/2 pounds medium red potatoes
• 4 tablespoons (1/2 stick) unsalted butter
• 1 tablespoon plus 1 1/2 teaspoons dried parsley
• 1 tablespoon garlic powder
• 3/4 cup whole milk, plus more as needed
• 3/4 ounce Parmesan cheese, finely grated (1/4 cup)
• 3/4 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• 2 tablespoons olive oil, plus more for the pasta and baking dishes
• Marinara sauce, for serving (optional)

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