Since I like using wholegrain and non refined products, I grind my flour and also use the same method with my sugar to receive a more industrial like smooth texture for baking. My blender is thermomix

Create flax egg by combining flax meal and hot water; let gel

Mix flour, sugar, baking powder, and salt in main mixing bowl

Add oil, milk, and vanilla to flax egg and whisk

Add liquid to dry ingredients and gently stir manually e.g. with a fork (don't beat!)

Fold in blueberries

Get muffin sheet ready by either lining with cute paper cups or greasing silicon or metal forms

Into 205°C oven for 20-22min or if smaller forms used reduce time to perhaps 15min

If on two baking sheets, I recommend hot air oven at 180°C for 19-20min

Let cool a bit before presenting them to eat. Taste good warm as well as cold

Ready to eat !!!