medium saucepan, melt butter and stir in flour to make a roux.
Cook 1 to 2 minutes, stirring constantly, then whisk in warm milk
a little at a time to make a white sauce. Bring to a boil, then
reduce heat and simmer. Mix in salt, pepper, and cayenne, and stir
frequently until sauce thickens.
pan from heat and stir in cheddar, mozzarella, jack and ham.
Combine pasta with sauce and stir well. Pour into baking dish. Use
paprika to make a decorative pattern on top. Bake 45 to 60
minutes, or until top is the desired crispiness. Let rest 20
minutes before serving.