INGREDIENTS
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1 1/2 lbs. fresh green beans, trimmed and cut into bite sized pieces
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3 tablespoons unsalted butter
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8 ounces cremini mushrooms, stemmed and sliced
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3 cloves garlic, minced
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5 tablespoons all purpose flour, divided
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1 teaspoon dry mustard powder (optional)
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2 1/2 cups milk*
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1 teaspoon kosher salt
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1/2 cup grated cheddar cheese
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1/3-1/2 cup canola oil (the oil should come up about 1/2″ from the bottom of the pan)
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3 large shallots, peeled and sliced into 1/4″ thick rings (you should have about 2 cups sliced)