Heat a large skillet over medium-low heat.
Add 2 tbsp butter and let it melt.
Add the chopped onions, 1/2 tsp salt, and 1/2 tsp sugar (optional, but it helps with caramelization).
Cook, stirring occasionally, for 25-30 minutes until the onions are golden brown and caramelized. Lower the heat if they start to burn.
Once the onions are caramelized, remove them from the pan and let them cool.
In a large mixing bowl, combine the softened cream cheese, sour cream, and mayonnaise.
Add garlic powder, onion powder, Worcestershire sauce (if using), salt, and pepper.
Mix well until smooth and creamy.
Once the caramelized onions have cooled, chop them into smaller pieces (optional, if you prefer smaller onion bits in the dip).
Add the onions to the creamy dip mixture and stir until well combined.
Cover the bowl and refrigerate the dip for at least 1-2 hours (or overnight) to let the flavors blend.
Remove from the fridge, stir well, and transfer to a serving bowl.
Garnish with fresh parsley, if desired, and serve with chips, crackers, or veggies. Enjoy!