Heat oven to 350 degrees. Partially cook Broccoli, slice chicken, allow 2-3 slices per serving. Melt butter in Casserole dish. Place a layer of chicken in bottom, season with salt and pepper if you wish. Arrange broccoli on top and cover with another layer of chicken. Blend remaining ingrediants in a blender except for cheese. Process till smooth. Pour over chicken. Sprinkle with Parmesan Cheese. (Cheddar is also very good in this recipe) Bake 25 min covered, and 20 min uncovered.