Preheat the oven to 200°C.

Rub the butter into the flour until it resembles breadcrumbs.

Grate the cheese.

Stir in the grated cheese, oats and 5ml mixed herbs.

Slice the leeks and red pepper.

Quarter the mushrooms.

Arrange the vegetables in a baking dish.

Pour over the canned tomatoes and 5ml mixed herbs.

Sprinkle the crumble topping over the vegetables.

Bake in the oven for 25-30 minutes until golden.