In large nonstick skillet, melt butter over medium heat. Add onions and salt and cook over medium low to low heat, stirring occasionally, until golden, about 25 minutes.
Stir in cream cheese, sour cream, mayonnaise and Buffalo Trace Whiskey Flavored Seasoning until combined. Serve warm or room temperature with crackers or chips for dipping. Sprinkle dip with additional Buffalo Trace Seasoning before serving.