Lightly soften the mushroom by simmering in a little water or place in a little water and microwave for about 1 minute. Drain off and place on a heatproof dish, topside down.
Place the beetroot slice on the mushroom base, top with the basil or spinach, keep this in place with the courgette slice and top with a good dollop of hummus to cover the mushroom.
Place the berries around the edge of the hummus and top off with the walnuts.
Bake, air fry or grill to heat through and slightly colour the hummus. Enjoy!