Preheat your oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish with nonstick cooking spray and set aside.

Cook the spaghetti according to the package instructions until al dente. Drain and set aside.

In a large skillet over medium heat, cook the ground beef until browned and fully cooked, breaking it up with a spoon as it cooks. Drain any excess grease.

Stir the marinara or spaghetti sauce into the cooked ground beef. Season with garlic powder, Italian seasoning, salt, and pepper. Simmer for 5 minutes, then remove from heat.

In a medium bowl, combine the ricotta cheese, cream cheese, sour cream, and 1/4 cup of Parmesan cheese. Mix until smooth and well-blended.

Layer half of the cooked spaghetti in the bottom of the prepared baking dish. Spread the cheese mixture evenly over the spaghetti.

Add the remaining spaghetti on top of the cheese layer, spreading it out evenly. Pour the meat sauce over the spaghetti, spreading it to cover completely.

Sprinkle the shredded mozzarella and remaining Parmesan cheese over the top. Dot with the small pieces of butter for extra richness.

Bake in the preheated oven for 30-35 minutes, or until the cheese is melted, bubbly, and slightly golden on top.

Remove the dish from the oven and let it sit for 5-10 minutes before serving. Serve hot and enjoy!