Preheat oven to 400 degrees.
Combine dry ingredients.
In a separate bowl, mix together the wet ingredients.
Add wet mixture to dry ingredients. Mix by hand, not with a mixer.
Carefully fold in blueberries.
Grease muffin tins (18) and spoon mixture into tins.
Bake for 20-25 minutes. While muffins are baking, combine lemon zest and sugar.
After removing muffins from oven, let sit for 5 minutes and then loosen edges and remove from pan.
Cool for 10 minutes, then dip tops in melted butter and then in lemon sugar.