banana oatmeal raisin muffins

After making Banana Oatmeal Almond Cookies, a friend suggested that I try Banana Oatmeal Raisin Muffins.  She said that it is very yummy and asked me to look up the internet.  I followed this recipe, I found in Rasa Malaysia website.
Ingredients
> 1/2 cup (80g) raisins 
> 1 tbsp water
Bowl A
> 1 1/2 cup all purpose flour 
> 1 tsp baking powder 
> 1/4 tsp baking soda 
> 1/4 tsp salt 
> 1/2 cup brown sugar
Bowl B
> 1/2 cup quick oats + extra for topping 
> 1/2 cup + 2 tbsp milk 
Bowl C
> 1 large egg
> 1/2 cup vegetable oil
> 2 over ripe bananas, mashed
Method
[1]  Soak raisins with 1 tbsp of water and chill for 2-3 hours.
[2]  When raisins are ready, remove from refrigerator, squeeze dry and pat with paper towel.
[3]  Preheat oven to 190 180°C.  Line a 12 muffins/cupcakes baking pan.
[4]  Bowl A:
Sieve flour, baking powder, baking soda and salt into a bowl. 
Add in brown sugar, whisk to mix the dry ingredients together and set aside.
[5]  Bowl B:  Combine quick oats and milk together.  Set aside.
[6]  Bowl C:
Beat egg.  Add in vegetable oil and beat to incorporate.
Add in mashed banana and mix well.
[7]  Make a well in the center of Bowl A and pour in Bowl C.
[8]  Use a spatula to fold the flour into the center until all combined with no traces of flour.
[9]  Next, fold in Bowl B.  Add raisins and fold a few more times.  Do not over mix.
[10]  Spoon batter into muffin tray until 75%-80% full.  Sprinkle some oats on top.
[11]  Bake at 190 180°C for 10 minutes.
[12]  Then reduce temperature to 180 170°C for another 8-10 minutes or until a cake tester inserted into the center come out clean.
[13]  Transfer muffins to wire rack to cool completely before storing the muffins in air tight containers.