Grandma's best Macaroni and cheese

Warning if you try this at home, you will become addicted and refuse to eat mac and cheese from a box of powdered cheese!!!!

ingredients :
2 cups of uncooked elbow macaroni
1 block of mild cheddar cheese, cut in cubes
1/2 cup onion, chopped
1 1/2 cup of milk (I use half and half)
3 tablespoons of flour
3 tablespoons of butter
dash of salt and pepper for taste

Instructions :
1. Cook the macaroni. set aside.
2. Melt 3 tablespoons of butter in a sauce pan. stir in 3 tablespoons of flour, add milk and stir until it thickens add salt and pepper.
3. Add the sauce and onion to the macaroni
4. Pour into a casserole dish, sprayed with a nonstick oil. lay strips of cheese over the top
5. Bake at 350* for 25-30 minutes until its thickened.

Now I added lean ground beef here to add protein to the main dish. I normally just stick with the recipe not adding anything special, however, you can add any meat or veggie to it!