01 - Preheat the oven to 375°F. Line a 12-cup muffin tin with paper liners or grease cups lightly with cooking spray.
02 - Whisk together flour, sugar, baking powder, baking soda, and salt in a large mixing bowl until thoroughly blended.
03 - In a separate bowl, whisk eggs, oil, yogurt, lemon zest, lemon juice, and vanilla extract until smooth and well incorporated.
04 - Pour wet ingredients into dry ingredients. Fold gently with a spatula just until combined; avoid overmixing to prevent tough muffins.
05 - Toss fresh raspberries with 1 tablespoon flour in a small bowl to prevent them from sinking to the bottom during baking.
06 - Gently fold flour-coated raspberries into the batter until evenly distributed. Frozen raspberries may be used unthawed.
07 - Divide batter evenly among the 12 muffin cups, filling each approximately three-quarters full using a spoon or ice cream scoop.
08 - Bake for 18 to 22 minutes until a toothpick inserted into the center comes out clean or with just a few moist crumbs.
09 - Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before serving.