01 -
Preheat your oven to 200 degrees C (390 F).
02 -
Melt butter and combine in a bowl with breadcrumbs, thyme leaves and grated parmesan. Set aside.
03 -
Lightly butter a 22 cm (8.5 inch) square baking dish or oval dish with 8 cup capacity.
04 -
Snap off woody ends of asparagus and cut into roughly 5 cm (2 inch) pieces.
05 -
Melt butter, add flour and whisk. Cook for a minute, then add milk. Whisk until sauce thickens to pouring cream consistency (5-7 minutes). Remove from heat, add cheese, mustard and pepper.
06 -
Add asparagus to baking dish, pour over cheese sauce, and sprinkle with breadcrumb topping.
07 -
Bake for 20-25 minutes until topping is crispy and golden and asparagus is cooked through. Cover with foil if topping browns too quickly.
08 -
Let stand for 5 minutes before serving.