In a large sauce pan on the stove top over medium-high heat, melt the butter. Remove 2 table spoons of the melted butter into a small bowl and set aside.

Whisk the flour in with the remaining butter in the pan on the stove top

Reduce the heat and continue stirring constantly for 2 minutes to make roux

Stir the hot half and half slowly into the flour mixture. Cook for 2 minutes, stirring occasionally

Once the milk is thick and smooth, add the Gruyere and parmesan, stir until.cheese melts

Stir in the nutmeg, salt, pepper, lobster, and Cooked macaroni. Be sure everything is mixed fully then remove from heat

Add the bread crumbs to the small bowl containing 2 tablespoons of melted butter, whisk to combine

Preheat smoker to 275°F add maple or apple wood chips

Pour the lobster macaroni into a disposable aluminum foil pan

Spread the bread crumbs mixture evenly on top, set the pan on the smoker rack

Smoke for about an hour, until bubbly and lightly browned on top

Remove Mac and cheese, let cool slightly, to set, before serving