Cook macaroni as directed and set aside while you cook 

Cook sausage in a large skillet over medium heat. Drain any excess oil if there is any. 

Once the meat has browned, reduce the temperature to medium-low and melt butter in the skillet. Once the butter has melted, mix in the flour. Cook for 2 minutes, stirring occasionally. Whisk in milk, bring to a boil, then reduce to heat to low. Continue to whisk until it thickens slightly, about 3-5 minutes. Remove from heat mix in cheese, paprika, onion powder, green chilies, and tomato.  If the sauce is too thick, add one milk tablespoon at a time until you get the desired consistency. Salt to taste. 

Mix in macaroni and serve.