Step 1

In a skillet over medium heat, melt butter and sauté mushrooms until soft, cooked through and slightly golden brown. Season with salt and pepper to taste. Remove and set aside. In the same pan, melt 2 tablespoons of butter and caramelize onions for about 15 minutes or until soft and they are golden brown.

Step 2

On two halves, evenly spread the cooked mushrooms and onion to cover the cut sides of each bread. Sprinkle with freshly grated brie cheese and on the other two halves, the cheddar cheese.

Step 3

Toast in a 250 degree F. oven for about 5 minutes, or until cheese is all nicely melted through, about 5 minutes.

Step 4

Add the fresh toppings, drizzle with ketchup and BBQ sauce and serve immediately.