1. Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or nonstick spray.

2. Bring a large pot of salted water to a boil and cook spaghetti until just al dente. Drain and set aside.

3. In a skillet over medium heat, brown the ground beef until cooked through. Drain excess fat.

4. Add marinara sauce to the beef and simmer for 5–10 minutes.

5. In a bowl, mix cream cheese, ricotta, and sour cream until smooth.

6. Place butter slices on the bottom of the baking dish. Add half the spaghetti.

7. Spread the entire cheese mixture over the spaghetti.

8. Layer with half the meat sauce. Add remaining spaghetti and top with the rest of the sauce.

9. Sprinkle mozzarella and Parmesan cheese on top.

10. Cover with foil and bake for 30 minutes. Remove foil and bake an additional 15–20 minutes until cheese is golden.

11. Let rest for 10 minutes before slicing. Garnish with parsley if desired.