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In a double boiler, heat the milk until hot, then whisk in the onion, garlic powder, brie, cheddar, and 1 cup of mozzarella cheese.
Once cheese is fully incorporated, add the jalapeños, salt and pepper.
Make a slurry with the corn starch and water, then add it to the sauce to thicken. Lastly, add the cooked bacon and penne.
Place the mac and cheese in a greased, cast iron pan and top with the remaining mozzarella cheese.
When ready to cook, start your Traeger on Smoke with the lid open until the fire is established (4 to 5 minutes). Set the temperature to 350 °F and preheat, lid closed (10 to 15 minutes).
Place the pan of mac on the Traeger and cook for 15 to 20 minutes, or until golden and bubbly. Serve, enjoy!