1. Preheat your oven to 350°F (175°C).
2. In a large skillet over medium heat, cook the ground beef until it’s browned, about 5-7 minutes. Drain excess fat.
3. Add the chopped onion and minced garlic to the skillet, cooking until the onion is translucent, about 3 minutes.
4. Stir in the tomato sauce, tomato paste, sugar, oregano, salt, and pepper. Let the mixture simmer for about 10 minutes, allowing the flavors to meld together.
5. In a large mixing bowl, combine the cooked egg noodles and sour cream, ensuring the noodles are evenly coated.
6. In a 9×13 inch baking dish, layer half of the noodle mixture at the bottom.
7. Spread half of the beef mixture over the noodles, followed by half of the cheddar and mozzarella cheeses.
8. Repeat the layers, ending with a generous topping of cheese.
9. Bake uncovered for 20-25 minutes, or until the cheese is bubbly and golden brown.
10. Let the casserole cool for a few minutes before serving, garnished with chopped parsley if desired.

Remember, cooking is about intuition and enjoyment. If it smells good, you’re on the right track!