Step 1: Prepare the Muffin Pan

• Preheat your oven to 375°F (190°C). Line a standard 12-cup muffin tin with paper liners, or lightly grease each cup with nonstick cooking spray.

Step 2: Mix the Dry Ingredients

• In a large mixing bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.

Step 3: Combine the Wet Ingredients

• In a separate bowl, whisk together the melted butter, granulated sugar, and brown sugar until smooth.
• Add the eggs, one at a time, beating well after each addition. Stir in the vanilla extract.
• Mix in the buttermilk and yogurt, ensuring all the wet ingredients are well combined.

Step 4: Combine Wet and Dry Ingredients

• Gradually add the dry ingredients to the wet ingredients, stirring gently with a wooden spoon or spatula. Mix just until the flour is incorporated; overmixing can lead to dense muffins.
• Fold in the chocolate chips, reserving a handful for sprinkling on top.

Step 5: Fill the Muffin Cups

• Divide the batter evenly among the prepared muffin cups, filling each about three-quarters full.
• Sprinkle a few extra chocolate chips on top of each muffin for a bakery-style finish.

Step 6: Bake the Muffins

• Bake the muffins in the preheated oven for 18–20 minutes, or until a toothpick inserted into the center comes out clean (a few melted chocolate streaks are fine).
• Remove the muffins from the oven and let them cool in the pan for 5 minutes. Then transfer them to a wire rack to cool completely.