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Spray the inside of a 2-quart casserole dish or baking dish with nonstick cooking spray and set aside.
Pour the melted butter over the tortilla chips and stir to coat the chips. Set aside.
Cook the macaroni according to the package directions in a pot of salted water until just barely tender. (Subtract 1 or 2 minutes from the recommended cooking time. The macaroni will continue to cook on the Traeger.)
Drain the macaroni in a colander. Return the pot to the stove and add the half and half. Heat over medium-low heat.
Gradually add the cubed cheese, stirring until it melts completely, about 5 minutes.
Pour the drained macaroni back to the pot and stir gently until the macaroni is coated with the cheese sauce and no clumps remain.
Tip the macaroni and cheese into the prepared casserole dish.
Sprinkle the buttered tortilla chips on evenly on top.
When ready to cook, start the Traeger grill on Smoke with the lid open until the fire is established (4 to 5 minutes).
Set the temperature to 350 degrees F and preheat, lid closed, for 10 to 15 minutes.
Put the casserole dish directly on the grill grate and bake for 35 to 40 minutes, or until the cheese sauce is bubbling and the tortilla chip topping is golden brown.
Let cool slightly before serving. Enjoy!