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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 250 degrees F and preheat, lid closed, for 10 to 15 minutes.
Put the butter and vegetable oil in a disposable foil pan and place it on the grill grate. When the butter is melted, stir in the onions, sugar, garlic salt, pepper, and thyme.
Combine the beef bouillon, Worcestershire sauce, and bourbon, if using, in a glass measuring cup and pour half over the onions.
Return the pan to the grill grate and cook the onions, stirring occasionally, until they are soft and golden brown (about 45 minutes to 1 hour). Let the onions cool completely.
While onions are cooking, combine the sour cream and cream cheese in a large mixing bowl and stir until smooth.
Stir in the cooled onions and chives, if using. Add more salt and pepper to taste.
Cover and chill until serving. Serve with crudits or potato chips. Enjoy!