Sift the dry ingredients into the wet, and using a rubber spatula, stir until everything is just mixed but still clumpy. Add blueberries, and mix again.
Divide the batter between muffin liners and bake for for 18-20 minutes, or until a toothpick inserted in the center comes out clean and the tops are golden.
The batter should be thick and scoopable. Vegan muffin batter doesn't have eggs, so it needs to be thick to rise. Don't add more liquid unless absolutely necessary!