Instructions: Heat oven to 350iF. In medium saucepan, melt 1/4 cup margarine; stir in flour and salt. Add milk. Cook until mixture boils and thickens, stirring constantly. Stir in cheeses and potatoes. Pour into greased 2 quart casserole dish. Combine crumbs with margarine; sprinkle over potatoes. Cover; bake for 1 to 1 1/2 hours or until bubbly.

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