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Preheat oven to 350⁰F/177⁰C.
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In a clean medium-sized pot, boil cubed potatoes and add salt, boil for 5 to 8 minutes or until potatoes are half cooked.
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Drain water from the pot and pour in the olive oil and toss the potatoes until all the potatoes are covered in oil. Set aside.
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Cheese sauce: In a sauce pot, melt butter then add flour, mix until flour is cooked.
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Add milk and cream, stir, until the mixture thickens.
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Add all the cheeses and stir until all the cheese are melted. Set aside.