If you have to have a snack and want to minimise the impact of the snack on your blood glucose levels, I'd modify it to swap tropical fruit like banana for berries. You can have these either fresh or frozen. I prefer frozen as this turns my yoghurt experience into frozen yoghurt experience. If you want, you can add other enhancements like vanilla essence and/or artificial sweetener like erythrol. Also, I go for a full fat version of Greek yoghurt as full fat versions of dairy products are generally lower in carbs.