Ingredients
- 1/4 cup butter (or margarine)
- 2 tablespoons all purpose flour
- 2 cups milk
- 3 tablespoons Parmesan cheese , grated
- 1/4 teaspoon thyme
- 1/4 teaspoon white pepper
- 1 pound potatoes, scrubbed and very thinly sliced, ( I leave the skin on unless they are very old potaotes)
- 1 pound yams, peeled and very thinly sliced
- 1 cup onion, thinly sliced
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