Blueberry muffins

This is an quick & easy blueberry muffins that I baked for my baby's 1st day of primary school. Packed with love *muack*

Ingredients:
120g plain flour
1/2 tsp baking soda
1 tsp baking powder
60g sugar
60g oil
80g milk
1 egg, beaten
1/2 punnet fresh blueberries (lightly mashed) 

1. Sift the flour. Set aside.
2. Mix all wet ingredients using mixer.
3. Add all dry ingredients to (2), and mix well. Add in blueberries. (*Do not over-mix, should be done in less than 5 minutes.)
4. Scoup mixture into muffin cups, upto 2/3rd full.
5. Bake in pre-heated over at 170 deg C for 20 minutes, in lower rack.
6. Check doneness by inserting toothpick and it come out clean.
7. Remove from oven and cool.