Preheat. Preheat your smoker to 225 degrees F.
Cook the noodles. Bring a large pot of salted water to a boil and cook macaroni noodles until they are al dente, meaning they still have a bit of chew and texture (not too soft).
Make the roux. 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.
Add the cheese. Carefully pour in the half and half and bring 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. Stir in ¼ cup of Frank's Buffalo Wing sauce.
Add noodles. Turn off the heat and pour in the cooked macaroni noodles. Stir gently until the noodles are coated by the cheese sauce.
Make the crumbs. Combine the melted butter, sweet rub, and panko bread crumbs in a small bowl. Sprinkle the bread crumb mixture over the top of the mac and cheese.
Smoke the chicken. Season the chicken thighs on both sides with the Beef Rub, or salt and pepper. Place the chicken thighs on the grill grates. Also set the skillet of mac and cheese on the smoker. Close the lid and smoke for 1 hour, until the chicken thighs read 160 degrees F.
Chop chicken. Remove the chicken from the grill (leave the Mac and cheese). Chop the chicken into cubes and toss with ¼ cup of Frank's Buffalo wing sauce and 1 Tablespoon of butter.
Assemble. Remove the mac and cheese from the smoker and top with the chopped and sauced smoked Buffalo chicken pieces. As you serve, get a perfect mix of chicken, crunchy topping, and creamy mac and cheese.