Preheat and prepare the pan: Heat the oven to 375°F (190°C). Line a 12-cup muffin tin with paper liners or lightly grease it.
Whisk the dry ingredients: In a large bowl, whisk flour, sugar, baking powder, baking soda, and salt.
This helps everything mix evenly and prevents clumps.
Mix the wet ingredients: In a separate bowl or large measuring cup, whisk eggs, milk, yogurt, oil, and vanilla until smooth.
Combine gently: Pour the wet mixture into the dry ingredients. Stir with a spatula until just combined. A few small lumps are fine. Don’t overmix; it keeps the muffins fluffy.
Add mix-ins: Fold in chocolate chips, berries, or your favorite add-ins.
If using juicy fruit, pat it dry first to avoid soggy spots.
Fill the cups: Divide the batter evenly among the muffin cups, about 3/4 full. Sprinkle with coarse sugar or cinnamon-sugar if you like.
Bake: Bake for 15–18 minutes, or until the tops are set and a toothpick comes out clean or with a few moist crumbs.
Cool: Let the muffins rest in the pan for 5 minutes, then transfer to a rack to cool. Enjoy warm or at room temperature.