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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 in the range of to 225 to 300 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 for a few minutes. 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, 45 minutes to 1 hour, depending on the temperature of your Traeger. Add the remainder of the bouillon mixture if the onions seem a bit dry. Let the onions cool completely.
In the meantime, combine the sour cream and cream cheese in a large mixing bowl and stir vigorously with a wooden spoon until smooth.
Stir in the cooled onions and chives, if using. Taste, adding more garlic salt or pepper as desired. Transfer to a serving bowl.
Cover and chill until serving time. Serve with crudits and potato chips. Enjoy!