INGREDIENTS
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1 1/2 cups crushed butter crackers (about 35 crackers) (recommended: Ritz)
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2 cups grated Cheddar, divided
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4 tablespoons (1/2 stick) unsalted butter, melted, plus 2 tablespoons cold unsalted butter, cut into pieces
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4 cups cooked elbow macaroni (about 8 ounces uncooked), drained and kept hot
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2 large eggs, beaten
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1/2 cup milk
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1/4 cup sour cream
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1/4 teaspoon salt