In a large bowl, take 1 ⅓ cups of all-purpose flour, 1 ½ tsp of baking powder, ¼ tsp of salt, and mix well.
Add ¾ cup of washed and drained blueberries and mix evenly
In a separate bowl, add ½ cup of sugar, 3 tbsp of vegetable oil, 3 tbsp of melted butter, 1 tsp of vanilla extract, 1 large-sized egg, and whisk well
Now incorporate a dry mixture of flour and blueberries and add buttermilk into it and mix until it gets smooth
Take a cupcake tray, set cupcake butter papers in it, and fill them almost to the top.
Now sprinkle the tops with little sugar
Bake them at 200o C (400o F) for about 20 minutes
Let the tray cool for a while after being taken out from the oven
Take the Muffins from the tray and enjoy the sweet and sour combination.