Whatever you got in the picture there ain't it.

Try this

2 tablespoons unsalted butter

2 tablespoons all-purpose flour

1/4 teaspoon salt

Medium heat stir until its a paste then add

1 cup whole milk

1 3/4 cups shredded sharp Cheddar cheese

stir until it has a consistent texture

Then you dump it on drained boiled macaroni and mix it in.