01 -
Peel and thinly slice the yellow onions using a sharp knife or mandoline.
02 -
Melt salted butter in a large skillet over medium heat. Add sliced onions, salt, and sugar, stirring to combine. Cook, stirring occasionally, until onions are softened and lightly golden.
03 -
Pour in dry white wine and continue to cook, allowing the mixture to deglaze the pan. Stir frequently and cook until onions become deeply caramelized and jam-like, approximately 30 to 40 minutes in total. Remove from heat and let cool to room temperature.
04 -
In a large mixing bowl, beat softened cream cheese and sour cream together until smooth and well combined.
05 -
Fold in the cooled caramelized onions, garlic if using, minced parsley, and Worcestershire or soy sauce if desired. Mix thoroughly and adjust seasoning as needed.
06 -
Transfer to a serving bowl or airtight container. Serve chilled or at room temperature with chips, crackers, fresh vegetables, or use as a sandwich spread. Refrigerate leftovers for up to 3 to 4 days.