In a bowl combine sugar, melted margarine, milk, apple sauce, vanilla extract and mix well
In another bowl combine rice flours, starch, salt, grated lemon zest, baking powder, baking soda and mix well
Add the liquid part to the dry ingredients and mix everything using a spatula, carefully scraping the flour on the bottom of the bowl too: do not over-mix, stop when ingredients are just nicely combined
Save a handulf of berries to add on top of the muffins and incorporate the remaining blueberries to the batter
Divide the batter into the molds and add a couple fresh blueberries on top of each muffin
Bake at 370 F / 190 C for 5 minutes then lower the temperature down to 340 F / 170 C and bake for 15-20 minutes or until the muffins are cooked inside (= toothpick comes out clean) and nice and golden on the top