INGREDIENTS
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3 Tablespoons butter
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12 ounces button mushrooms, sliced
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½ onion, diced finely
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1 lb. asparagus, trimmed and cut into 1-inch pieces
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6 Thomas English muffins, cut into 1-inch pieces
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2 cups shredded Mexican blend cheese, divided
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8 eggs, beaten
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2 cups milk
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1 teaspoon ground mustard
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1 teaspoon salt
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¼ teaspoon pepper
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(optional) hot sauce