In a bowl, mash all ingredients together, with the exception of the avocado and breadcrumbs. Keep the mixture course but well mixed. Season with a little salt and ground black pepper.
Cut the avocado’s in half and remove the stones and skin. Cut each half into about 4 slices and arrange in the bottom of each small ovenproof, gratin dish.
Top with the crab mix, dividing between the 6 dishes and sprinkle with a scattering of breadcrumbs.
Place in a hot oven 400F/200c/ Gas 6 for about 15 mins and then under a hot grill to brown and crisp the breadcrumbs.
Alternatively store in the fridge until required and allow an extra 5 minutes in the oven.