In the 1970' London we ate loads of squirrel, then in USA we would hunt them late summer to camp in the woods and scout for the autumn deer hunting.
Squirrel pie is the answer. Skin 2 - 3 of them (hard) gut, cut in 5 pieces. simmer in as little water as possible, pack them into pot like pieces of a puzzle, then barely cover with water. Take meat off when it will just pull off the bones - do not cook till it falls off the bones or you will get bone fragments in the pie. De-bone. Boil liquid with some chicken stock powder to make the pie base - generous amount of stock powder - could use gravy powder.
Mix flour with water, couple T of each, more water, till - till it is thickish but pours easily. Get stock boiling, pour in flour mix slowly - wile whisking with a whisk, or siring fast with a spoon - done wrong it will be lumpy so do it right - do this till the stock is thick, like a pie should be. Then stir in 10 oz frozen peas, still frozen, and the meat.
I buy 2 pie shells and pre-cook the bottom one (thaw, ***** with fork all over so it stays flat, cook 400F 10 minutes - 200C)
Put mix in shell, cover with second raw, thawed crust so it overlaps pie, trim overhang. slice in top for steam, bake an hour at 350f, 170C - till done.
I made this a hundred times, my wife and friends loved it. Now I would add some canned, concentrated, cream of chicken soup to the stock for additional flavor - but did not then. Try with rabbit. Or a pigeon and a squirrel, or anything. It is excellent with squirrel - usually only takes 2 squirrels for a big pie, they are surprisingly meaty.