I fly from Sofia a lot and your choices of places to eat are (terminal two I assume):

Sky cafe / bar - over priced and not very appealing food.

replay - like a newagents sells like pre packed sandwiches etc can be quite pricey for what it is.

lounges - there is three in Sofia the one BA uses is okay has the basics and there is also a star alliance lounge which I’ve never used before.

Apart from that the departures is rather disappointing don’t expect a Mac Donald’s or a coffee shop 😐