Muffin Blueberry Lembab

Bahan-bahan (12 porsi)

• 2 1/2 cups plain flour ((all purpose flour))
• 3 tsp baking powder
• 1 tsp baking soda / bi carb soda ((sub extra 3 tsp baking powder))
• 1 cup white sugar ((caster, granulated or superfine))
• 1/4 tsp salt
• 1 cup buttermilk ((Note 1))
• 60 g / 4 tbsp butter (, unsalted, melted)
• 4 tbsp vegetable oil
• 2 large eggs (, at room temperature, lightly whisked (Note 2))
• 2 tsp vanilla extract
• 250 g / 8 oz blueberries (, fresh (~2 cups, Note 3))