Using a sharp bread knife, cut through the bread going both directions making sure not to cut through the bottom crust.
Place the cheese slices between the cuts. Mix together the remaining ingredients and pour over the bread. Wrap the bread completely in foil and place it on a baking sheet. Bake in a preheated 350 degree oven for 15 minutes. Unwrap the foil and bake for an additional 10 minutes.