Ingredients
Bechamel sauce
Method
1.Cook pasta in large saucepan of boiling water until tender; drain.
2.Meanwhile, make bechamel sauce: Melt butter in medium saucepan, add flour; cook, stirring, 1 minute. Gradually stir in milk; stir until sauce boils and thickens. Remove from heat; stir in cheese.
3.Preheat oven to 180°C.
4.Heat oil and butter in medium frying pan; cook garlic, leek and mushrooms, stirring, until leek softens.
5.Combine pasta and leek mixture in large bowl with chives and peas. Reserve 2/3 cup (180ml) bechamel sauce for top. Stir remaining sauce into leek mixture. Spoon leek mixture into 3.75-litre (15-cup) ovenproof dish; spread with reserved bechamel sauce.
6.Bake about 40 minutes or until the top is browned lightly.