Gluten-Free Ginger Molasses Cookies

GF oat flour (such as Bob's Red Mill) ((4 1/2 ounces))

sweet rice flour (such as Koda Farms Mochiko) ((4 ounces))

tapioca flour (such as Bob's Red Mill) ((1 ounce))

baking soda

ground ginger

ground cinnamon

ground allspice

freshly ground black pepper

fine sea salt

unsalted butter, melted and kept warm ((4 ounces))

molasses (I use dark unsulphured) ((3 1/2 ounces))

light or dark brown sugar ((2 1/4 ounces))

granulated sugar (preferably organic cane sugar), plus another 1/3 cup for rolling the cookies ((2 1/4 ounces))

large egg ((2 ounces out of shell))

vanilla extract