-
Preheat oven to 350 degrees F. Lightly grease an 8 or 9 inch baking pan or cast iron skillet with non-stick cooking spray.
-
In a large skillet on medium heat, add olive oil.
-
When oil is hot, add onions, garlic, and brown sugar.
-
Reduce heat to medium low and cook, stirring occasionally, until the onions are very soft and caramelized, about 20 minutes.
-
Once caramelized, add beef broth and bring to a simmer.
-
Remove from heat and stir in cream cheese, sour cream, salt, pepper, dried thyme and ½ cup Gruyere Cheese.
-
Pour into baking dish and top with remaining cheese.
-
Bake for 15-20 minutes until cheese has slightly browned and edges are bubbly.
-
Serve with toasted baguette slices.