Preheat the oven to 180°C (350°F) and line a 12-cup muffin tin with paper liners.
In a large bowl, whisk together the all-purpose flour, granulated sugar, baking powder, baking soda, and salt until well combined.
In a separate bowl, beat the eggs with the plain yogurt, vegetable oil, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and gently fold together using a spatula until just combined. Do not overmix; the batter should be slightly lumpy.
Fold in the dark chocolate chips evenly throughout the batter.
Divide the batter evenly among the 12 muffin cups, filling each about three-quarters full.
Bake in the preheated oven for 18 to 20 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
Remove the muffins from the oven and allow them to cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.
Serve the muffins warm or at room temperature.