A food processor of the kind described in the specification of British patent 1,380,318 which is rendered suitable for placing in a microwave oven by the replacement of the usual metal spring controlling a switch actuating member by resilient means (23) such as silicone rubber that is not effected by microwave radiation. Such a food processor may be provided with a special lid (24) having a downwardly extending member (26) arranged to co-operate with the usual central sleeve (12) of a container (10, 11, 12) of the food processor so that a cake mixture prepared in the food processor can be baked in the container (10, 11, 12) in which it is prepared, the depending member (26) preventing overflow of the cake mixture through the sleeve (121.