Whisk the flour, baking powder, and salt together in a medium bowl.
In a separate bowl, whisk the nut milk, eggs, oil, and honey together. Pour over the dry mixture, and stir with a fork until just combined. Fold in the blueberries. Let the batter rest for 5 minutes.
Meanwhile, heat your waffle iron. Pour, or ladle, enough batter to cover about 2/3 of the surface (the rest will spread once you close the top). Cook according to the manufacturer’s directions. A sure sign of doneness is once you see all the steam has stopped shooting out the sides.