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1 finely chopped sweet onion, plus a splash of olive oil
1/2 cup beef broth
1/4 cup sherry (or sherry cooking wine)
8 ounces cream cheese, softened
2 cups shredded gruyére
Preheat the oven to 350. In a large pan, add the onions with a splash of olive oil; sauté on medium-low heat for 10 minutes. Once the onion is softened, add the broth and sherry, and let it cook an additional five minutes. From there, add the onion mixture to a large bowl along with the cream cheese and 1 cup of gruyére, and stir to combine. Transfer the mixture to an oven-safe dish, and top it with the remaining cup of cheese.
Bake for 15 minutes; to get the cheese topping a bit crispy, you can also broil the dip on high for an additional 2-4 minutes once the cooking time is done. Serve with chips or toasted baguette slices.