The gf flour makes them light and delicate.
Let berries thaw a little bit. Run them under cool water to thaw — e.g. in a pyrex measuring cup where you can swirl the water around the berries.
Make pancake mix as normal and then add lots of berries — raspberries are especially good, strawberries might need to be chopped, blueberries are generally well-liked.
You can substitute toasted chopped pecans for the berries