Heat butter in a frying pan and cook mushrooms and garlic for 5 minutes. Season with salt and pepper. Remove and drain off any excess juices, cool

Preheat jaffle maker until green light switches on

Butter one side of each slice and place bread, buttered side down. Spread mushroom evenly over 4 slices. Top with taleggio and prosciutto and cover with remaining bread, buttered side up

Place into jaffle maker, close lid and cook 3 minutes or until bread is crisp and golden