INGREDIENTS
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3 tablespoons butter
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3 tablespoons flour
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2 cups milk
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1 teaspoon Dijon mustard (optional)
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2 cups sharp cheddar cheese, grated (reserve 1/4 cup to sprinkle on top)
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4 cups of Russet potatoes, peeled & sliced (about 4 potatoes)
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Half of one medium sweet onion, thinly sliced (optional)
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1 sprig rosemary (optional)
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Salt and pepper