Preparation: Heat medium size skillet over low heat.
In a small bowl, combine sour cream and ranch dressing. Add bacon, chicken and cheese. Spread equal amounts of butter between both sides of bread. Place one buttered slice of bread down into warm pan, layer with sliced cheers and mixture. Place second slice of bread buttered side facing up. Turn heat to medium and cook until bread is browned and crispy, about 2-4 minutes. Flip sandwich and cook until second slice of bread is just slight browned, then place bowl on top sandwich for an additional minute or so to melt cheese. Serve immediately.