Step 1: Cook the Spaghetti

• Bring a large pot of salted water to a boil.
• Cook the spaghetti according to the package instructions until al dente.
• Drain and set aside.

Step 2: Prepare the Cream Cheese Mixture

• In a large bowl, whisk together the softened cream cheese, sour cream, milk, garlic powder, salt, and black pepper.
• Add the cooked spaghetti and toss to coat evenly in the creamy mixture.

Step 3: Make the Meat Sauce

• Heat a large skillet over medium heat.
• Add the ground beef or turkey and cook until browned, breaking it up with a spatula.
• Add the onions and garlic and sauté until softened.
• Stir in the marinara sauce, Italian seasoning, paprika, red pepper flakes, salt, and pepper.
• Simmer for 5–7 minutes, allowing the flavors to meld.

Step 4: Assemble the Casserole

• Preheat your oven to 375°F (190°C).
• Lightly grease a 9×13-inch baking dish.
• Spread half of the meat sauce on the bottom of the dish.
• Add the creamy spaghetti layer, spreading it evenly.
• Pour the remaining meat sauce over the spaghetti.
• Sprinkle with mozzarella, cheddar, and Parmesan cheese.

Step 5: Bake the Casserole

• Cover with foil and bake for 20 minutes.
• Remove the foil and bake for an additional 10–15 minutes until the cheese is bubbly and golden.
• Garnish with fresh parsley and serve hot!