Although a regular coxinha really is the size and shape of a pear, these are mini versions, and you can get a fabulous 70 out of not much more than three small chicken breasts (although I feel I should have used 6 chicken thigh fillets instead, given the name of this dish) and a great deal of flour. Yes, they are time-consuming to make, but if you get a bunch of friends together and get a little conveyer belt going, it is enormously companionable.
I have given measurements below, but I find it easier to think in terms of ratios: in other words, for each cup of chopped cooked chicken, you will need a cup of flour and a cup of liquid. By the way, I find a small chicken breast fillet yields one cup of chopped meat.
Helio, whose recipe this is, says that in Brazil these are commonly made and then frozen and then dipped in egg and breadcrumbs and deep fried from frozen.
Recipe posted by Nigella