Preheat oven to 375°F

• 500 g macaroni

Cook pasta al dente.

• ²⁄₃ cup (151 g) butter

Melt butter in saucepan.

• ²⁄₃ cup (83 g) all-purpose flour

Add flour, stirring together to make a roux.

• 5 cups (1.185 kg) milk

Slowly add milk, ensuring that the consistency stays thick.

• 1 onion, finely diced
• 1 tsp. dijon mustard
• 600 g grated cheddar cheese
• ¹⁄₂ tsp (3 g) salt
• ¹⁄₄ tsp black pepper
• ¹⁄₈ tsp nutmeg

Stir in onion, cheese, mustard, nutmeg, salt, and pepper.

Combine sauce with pasta.

• 150 g grated cheddar cheese

Sprinkle cheese on top.

• ³⁄₄ cup (93 g) bread crumbs
• 2 Tbsp (28 g) butter, melted

Toss butter and bread crumbs together and then sprinkle bread crumbs on top.

Bake at 375F for 30 minutes or until golden on top.