Step 1

Preheat oven grill to high. Lightly grease a 12-cup capacity baking dish with butter.

Step 2

Melt the butter in a small saucepan over medium heat until foaming. Cook the flour, stirring, for 2 minutes or until golden. Remove from heat. Slowly stir in milk until smooth. Stir over medium heat until thickened. Stir in the cheddar, gruyere and 2 tablespoons parmesan. Season.

Step 3

Cook gnocchi in a large saucepan of boiling salted water, following packet directions, until al dente. Drain. Return to pan. Stir in the bechamel. Spoon into prepared dish.

Step 4

Place the breadcrumbs and remaining parmesan in a bowl. Combine the oil, thyme and garlic in a bowl. Pour over the breadcrumb mixture and stir to combine. Sprinkle over gnocchi. Cook under grill for 3-4 minutes or until crisp and golden.