Pre-heat oven to 350 degrees. Heat skillet to medium heat. Add butter and flour and stir into a smoothe paste. cook 1 - 2 minutes. add milk, seasonings, and onions , stir until mixture begins to thicken. Add cheeses together until smoothe. Add spinach until well mixed together. Put into a 1 1/2 - quart sized casserole dish. sprinkle the top with parmesan cheeseand bake for 25 minutes. Serve with crusty baquettes or tortilla chips.
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