Heat your grill to 350° using indirect cooking
Melt butter and stir with panko crumbs, set aside
In a small bowl mix the topping ingredients (listed above) and set aside
Bring pot of salted water to boil and cook macaroni (al dente) about 6 minutes
Drain macaroni and return to warm pot
Add butter and stir until melted
Add shredded and Velveeta cheeses, stir until melted
Add half and half, salt, stir and pour in to a pan
Slather cheese topping on and then sprinkle the Panko topping on
Place in to your preheated smoker for 30 minutes
Let rest 5 minutes the serve