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Bring a large pot of salted water to a boil over high heat. Add pasta and cook according to manufacturers directions. Drain and set aside.
In a medium bowl mix yogurt, milk, ground mustard, and celery salt. Fold in mushrooms, tuna, peas and cooked pasta. Fold in half the cheese.
Transfer the mixture to a greased 13x9 baking dish and top with remaining cheese.
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 10-15 minutes.
Place casserole dish directly on grill grate and cook for 45 minutes or until warmed through and cheese is melted. Enjoy!