I just saw a recipe for microwave sponge cake. The mixture is strained before putting in a siphon and charging. However, there is no mention if that is a NO2 or a CO2 cartridge. Can someone confirm?
This type of "modernist" microwave sponge cake is usually charged with NO2.
One tip, since they can collapse rapidly after cooking: It is best to flip the cakes over when you remove them from the microwave, so that the cup is upside down. Let them cool a bit that way, then release them from their cup.