Chocolate Chip Muffins

1. Place the flour, baking powder, sugar, salt, and vanilla extract in the bowl of a stand mixer fitted with the flat beater.
2. Blend for 30 seconds at the appropriate speed.
3. Place a new bowl in the mixer and add the sunflower oil, milk, melted butter, eggs, and sour cream. Blend on speed 2 for 1 minute.
5. Add the wet ingredients to the dry ingredients and blend on speed 2 until smooth.
6. Place the chocolate in a blender and blend on speed 1 until the chocolate is chopped.
7. Add the chocolate to the muffin batter. Blend on speed 1 until the ingredients are well combined.
8. Line a 12-cup muffin tin with liners.
9. Divide the batter among the liners on the tin, filling them almost full.
9. Bake in a preheated oven at 180°C for 25-30 minutes until the surface is golden and the center is firm.