Arrange chicken breasts in 2 qt. oblong baking dish (or a larger one depending on how many breasts you have). Melt the first 4 tablespoons of butter in saucepan with 4 tablespoons of flour; add the chicken broth and Half and Half. Stir well to get all lumps out; cook over medium heat until thick and bubbly (stirring constantly). Sprinkle breasts with salt and pepper and oregano. Then pour all the sauce over breasts. Bake at 325 degrees for 50 minutes. Take out and lay sliced swiss cheese on each breast; sprinkle the dressing (3/4 cup that has been mixed with the second 4 tablespoons of butter); over the breasts; bake another 15 minutes. ENJOY!