Yes, it is very quick and easy to do, and because you cook the custard at a very low temperature, you do not need to use a bain-marie. To make four individual custards, put 300 ml of milk in a microwave-safe jug and heat it on Medium for 1.5 to 2 minutes. Whisk two medium eggs, 2 tablespoons of caster sugar and a few drops of vanilla essence together, then pour on the warm milk, whisking continuously. Strain into four ramekins and sprinkle with nutmeg. Microwave the ramekins on Low for 5-7 minutes, stirring occasionally until the custard is just set, then leave it to stand for 1 minute.
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