Melt the butter in a large heavy-bottomed skillet over medium-low heat.
2 tablespoons unsalted butter
Add the sliced onions and salt to the skillet and mix well. Keep the heat set at medium-low and cook the onions, stirring occasionally until they are caramelized and dark golden brown, about 20-25 minutes. If they start to stick to the bottom of the pan, add a few tablespoons of water.
2 sweet onions, ¼ teaspoon kosher salt
Once the onions are caramelized, transfer them to a bowl and let them cool to room temperature, about 20 minutes.
In a large bowl, use a spatula or hand/stand mixer to mix the sour cream and softened cream cheese together until smooth.
1½ cups sour cream, 2 ounces cream cheese
Add the caramelized onions, garlic powder, and parsley. Stir to combine.
¼ teaspoon garlic powder, 1 teaspoon chopped fresh parsley
Season with salt and pepper to taste. Serve with fresh vegetables, chips, pretzels, or crackers and enjoy.
Kosher salt and ground black pepper