Bring a large pot of water to a boil on the stove
Add the peaches into the boiling water, a few at a time, and let sit for 45 seconds. Remove with a slotted spoon and set aside to cool. Repeat with remaining peaches.
Once peaches have cooled enough to hold, peel of the skins and then cut them up into slices and discard the pit.
Transfer sliced peaches to a baking dish, about 9x9 inches
Add the blueberries, flour, lemon juice and zest, salt and brown sugar and toss together.