Ingredients
- 1/2 pound elbow macaroni
- 3 tablespoons butter
- 3 tablespoons all-purpose flour
- 1 tablespoon mustard powder
- 3 cups milk
- 1/2 cup minced yellow onion
- 1/2 teaspoon paprika
- 1 bay leaf
- 1 large egg
- 12 ounces shredded sharp Cheddar cheese, divided
- 1 teaspoon kosher salt
- Freshly ground black pepper
- Topping:
- 1 cup panko bread crumbs
- 3 tablespoons butter, melted
Directions
Preheat oven to 350 degrees F (175 degrees C).
Bring a large pot of lightly salted water to a boil. Cook elbow macaroni in the boiling water, stirring occasionally until cooked through but firm to the bite, 8 minutes. Drain.
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Melt 3 tablespoons butter in a pot over medium heat. Whisk flour and mustard powder into melted butter until smooth, about 5 minutes. Mix milk, onion, paprika, and bay leaf into flour mixture; bring to a boil, reduce heat to medium, and simmer until sauce is thickened, about 10 minutes. Remove bay leaf from sauce.
Beat about 2 tablespoons sauce and egg together in a bowl to temper egg. Pour egg mixture into sauce and stir gently. Mix 3/4 of the Cheddar cheese into the sauce until melted and smooth, 2 to 3 minutes; season with salt and pepper. Fold macaroni into cheese sauce and pour into a 2-quart casserole dish. Sprinkle remaining cheese over macaroni mixture.
Stir panko bread crumbs and 3 tablespoons melted butter together in a bowl; sprinkle over cheese layer.
Bake in the preheated oven until cheese is melted and topping is lightly browned, about 30 minutes.