Banana muffins

I was amazed at myself for being able to get this done in less than 20mins. You can too!

Ingredients

150gm flour
1 ½ tsp baking powder
½ tsp baking soda
70gsm brown sugar
1 egg
5 large riped bananas (mash)
¼ tsp mix spices
70gm melted butter (unsalted)
⅛ tsp salt