Preheat the oven to 200°C (400°F). In a bowl, combine the flour, baking powder, baking soda, and salt; set aside.
2
In a separate mixing bowl, combine the melted butter, oil, sugar, and eggs. Whisk for about 2 minutes until the mixture becomes pale yellow.
3
Add the yogurt, milk, and vanilla extract. Mix until everything is well incorporated.
4
Add the dry ingredients to the wet mixture. Stir until just combined, scraping down the sides and bottom of the bowl.
5
Place muffin liners in a regular-sized muffin tin. Divide the batter evenly among the lined cups.
6
Bake in the preheated oven at 200°C (400°F) for 5 minutes. Reduce the heat to 180°C (350°F) and continue baking for about 15 minutes, or until a toothpick inserted into the center comes out clean.