Macaroni & Cheese (Baked)

Ingredients

1/2 lb (227g) elbow macaroni
3 Tbsp butter
3 Tbsp flour
1 Tbsp powdered mustard
3 c milk
1 red onion finely chopped
2 tsp Tabasco Pepper Sauce
1 bay leaf
1/2 tsp paprika
1 large egg
12 oz (340g) sharp cheddar, shredded
1 tsp salt
Fresh black pepper

Topping

3 tbsp butter
1 c panko bread crumbs