Grease your bowls
Cut strips of greaseproof about an inch wide
Lay them in to the bowls - two should be enough
Fill with cake batter, should be about an inch below the top of the bowls
Place a sheet on top of the cakes for about 10 seconds as soon as they come out of the oven
Now you have nice, flat tops.
Leave to cool in the bowl, and then turn out.