First cook the pasta according to package instructions and set aside.
In a pot heat oil and cook the tomato meat sauce.
Fry the garlic, onion, and bell pepper for 3 to 5 minutes.
Add the ground beef. Keep cooking until it browns.
Add the Knorr Beef Cube. Stir.
In the cooking pot pour the tomato sauce. Stir and let boil.
Sprinkle some ground black pepper and salt. Continue to cook for 5 minutes. Set aside.
In a pot melt the butter to prepare the white sauce.
Add the all-purpose flour and stir until the flour absorbs the butter and lumps are formed.
Pour the milk in the cooking pot. constantly stir the mixture while heating the milk til the flour dilutes completely. You can use a wire whisk while mixing to make the texture smooth.
Add quick melt cheese. Continue to stir til the cheese completely melts and is well blended with the mixture. Turn off the heat.
In a mixing bowl arrange the macaroni. Pour the tomato meat sauce in and mix well. Add some tablespoons of the white sauce in the bowl along with some shredded cheddar cheese. Mix well.
Arrange the macaroni mixture on a baking pan and top with remaining white sauce. Spread the sauce all over to cover the top.
Preheat oven to 375F. Bake for about 15 to 18 minutes.