3 tablespoons butter
3 tablespoons gluten free all purpose flour
1 tablespoon powdered mustard
3 cups milk
1/2 cup yellow onion, finely diced
1 bay leaf
1/2 teaspoon paprika
1 large egg
12 ounces sharp cheddar, shredded
1 teaspoon kosher salt
Fresh black pepper
Temper in the egg. Stir in 3/4 of the cheese. Season with salt and pepper. Fold the macaroni into the mix and pour into a 2-quart casserole dish. Top with remaining cheese.
Bake for 30 minutes. Remove from oven and rest for five minutes before serving.