Peel and thinly slice the onions.
Melt the butter in a skillet over medium heat. Add the onions and begin to sauté.
Once the onions are golden brown, add the brown sugar and stir to combine, allowing the onions to caramelize.
Pour in the white wine and cook until the alcohol evaporates and the sauce slightly thickens.
Stir in the sour cream, fresh thyme, and season with salt and pepper to taste.
Let cool slightly and serve with fresh bread, roasted vegetables, or as a dipping sauce.
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