Ingredients
1/2 pound elbow macaroni
3 tablespoons butter
3 tablespoons 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

Topping:
3 tablespoons butter
1 cup panko bread crumbs

Directions
Preheat oven to 350 degrees F.

In a large pot of boiling, salted water cook the pasta to al dente.