Preheat oven to 400 degrees
In a large bowl mix flour, sugar, baking powder, salt - set aside
Make your flax egg by mixing ground flaxseed and water, let sit for 5 minutes until it becomes gelatinous
In a separate bowl mix plant milk, oil and vanilla extract
add wet ingredients (flax egg and milk mixture) into dry ingredients
lightly whisk/mix (don't overmix) the batter should be thick. add a splash of plant milk if your batter is too thick
Add batter into muffin liners, dropping in floured blueberries
sprinkle with toppings
As soon as you put the muffins into the oven, lower the temperature to 375
Bake for 18-25 minutes