Chocolate Banana Custard Éclairs, Gluten-Free

gluten-free flour (1 oz. superfine brown rice flour, 1 oz. superfine white rice flour,1 oz. GF oat flour, 1.75 oz. of tapioca starch) (about 1¼ cups)

kosher salt

sugar

or scant ⅓ cup of unsalted butter

whole milk

or 4 large whole eggs, room temperature (important)

or use your own favorite pudding or custard

(about ¾ cup) heavy cream, heated to a simmer

mixed bittersweet and semisweet chocolate chopped

unsalted butter, room temperature