Boil water in a large pot. Add salt and spaghetti. Cook until just tender. Do not overcook. Drain using a colander and set aside for later use.

Heat olive oil in a skillet. Add chopped onion and cook until soft. Add garlic and cook briefly. Add ground beef and cook until browned completely.

Add tomato sauce and tomato paste to the beef. Stir well. Add Italian seasoning, salt and pepper. Let the sauce simmer for about 10 minutes.

Add cooked spaghetti into the sauce. Mix gently until pasta is fully coated. This step helps every bite have rich flavor and perfect seasoning.

Preheat oven to 180°C. Grease a baking dish lightly. Spread half of the spaghetti mixture evenly in the dish to create the first layer.

Sprinkle mozzarella and cheddar cheese over the first layer. Add the remaining spaghetti mixture on top. This creates a nice layered texture.

Add remaining mozzarella and parmesan cheese on top. Spread evenly for a golden crust. Cheese will melt and form a delicious topping while baking.

Place the dish in the oven. Bake for about 25–30 minutes. The top should be bubbly and golden. Let it cool slightly before serving.