Step 1

Cook the noodles. Bring a large pot of salted water to a boil and cook macaroni noodles according to package directions and drain.

Step 2

Make the sauce. Heat a 12 inch cast iron skillet over medium heat. Melt 1/2 cup of butter and whisk in the flour until a smooth, thin paste forms. Then whisk in the mustard powder.Carefully pour in the half and half and bring the mixture up to a boil while whisking. Reduce the heat and whisk in the cream cheese until smooth. Whisk in the cheddar cheese and Gouda cheese and stir until melted.

Step 3

Combine the noodles and sauce. Turn off the heat and pour in the cooked macaroni noodles. Stir gently until the noodles are coated by the cheese sauce. Serve immediately.