Add cream cheese, sour cream, blue cheese, gin, vermouth, lemon zest, 60 g olive brine, onion powder, garlic powder and a large pinch of salt. Blend for 20 sec/speed 4/MC on. Scrape mixer bowl down.
Blend for a further 5 sec/speed 9/MC on. Scrape out into serving bowl and place in fridge.
Discard remaining brine and cut olives into quarters.
At this stage you can either serve the dip immediately topped with olives and a drizzle of olive oil, or you can wait a few hours to overnight for the dip to thicken and flavours to develop.
optional changes: substitute sicilian olives for pimento stuffed olives OR anchovy stuffed olives depending on how you take your martini.