"Meet the Cook: No matter when I've made these - for breakfast, brunch or lunch - they have never failed. I have not had them fall once. I often get asked for the recipe. -Jean Ference, Sherwood Park, Alberta..."
INGREDIENTS
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1/3 cup butter, cubed
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1/3 cup King Arthur Unbleached All-Purpose Flour
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2 cups whole milk
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1 teaspoon Dijon mustard
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1/4 teaspoon salt
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Dash hot pepper sauce
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1-1/2 cups (6 ounces) shredded Swiss cheese
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1 cup (4 ounces) shredded cheddar cheese
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1/4 cup shredded Parmesan cheese
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6 eggs
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1/2 teaspoon cream of tartar