Step 1

Bring salted water to a boil in a medium sauce pan. Prepare pasta according to package directions. Drain.

Step 2

In the same pan, with the burner on medium heat, melt butter in the sauce pan until simmering. Sprinkle flour over the melted butter and whisk to form a pasta. Allow the pasta to cook until golden brown. Slowly whisk in milk until it creates a smooth sauce. Start with pouring in approximately 2/3 cup of milk. Use the remaining milk, up to 3/4 cup of milk for a thinner cheese sauce. Sprinkle in mustard powder. Add in shredded cheese and stir in until thick and creamy.

Step 3

Add in drained pasta noodles and fold in to the cheese sauce until the noodles are all covered. Serve immediately.