Ingredients:
- 3 large (approx. 1.5 lb / 680g) yellow onions, thinly sliced
- 4 tbsp (56g) unsalted butter
- 1 tsp (6g) kosher salt
- 8 oz (225g) full-fat cream cheese, softened
- ½ cup (120ml) sour cream
- 1 tbsp (15ml) Worcestershire sauce
- ½ tsp (2g) garlic powder
- ½ tsp (2g) onion powder
- 1 cup (115g) Gruyère cheese, shredded
- Fresh parsley, chopped
Instructions:
- Melt the butter in a large heavy-bottomed skillet over medium heat until foaming.
- Add the sliced onions and salt, stirring to coat. Cook, stirring occasionally, for 30–40 minutes until the onions reach a deep, jammy mahogany color.
- Remove the caramelized onions from heat and let them cool slightly.
- In a medium mixing bowl, beat the softened cream cheese until smooth.
- Stir in the sour cream, Worcestershire sauce, garlic powder, and onion powder until the mixture is velvety.
- Gently fold in the caramelized onions and transfer the mixture into an 8-inch oven-safe baking dish, smoothing the top.
- Preheat the oven to 375°F (190°C).
- Spread the shredded Gruyère cheese evenly over the top of the dip.
- Bake for 15–20 minutes, or until the edges are bubbling and the cheese has developed golden-brown spots.
- Garnish with chopped fresh parsley and serve immediately.