Alfredo Shrimp Scampi Dump Dinner

Ingredients

• Kosher salt and freshly ground black pepper
• 12 ounces rotini pasta
• 1/4 teaspoon red pepper flakes
• 1/2 cup heavy cream, warmed
• 1/2 cup grated Parmesan
• 2 cloves garlic, minced
• 1/3 cup loosely packed fresh parsley, chopped
• Zest of 1/2 lemon
• 1 pound frozen peeled and deveined medium shrimp
• 4 tablespoons unsalted butter, cut into 1/2-inch cubes, plus more for the casserole dish
• 2 cups chicken broth