01 - Preheat oven to 375°F. Line 12-cup muffin tin with paper liners or grease lightly with cooking spray.
02 - In large bowl, whisk together flour, sugar, baking powder, baking soda, and salt until evenly distributed.
03 - In separate bowl, whisk eggs, oil, yogurt, lemon zest, lemon juice, and vanilla until smooth and thoroughly combined.
04 - Pour wet ingredients into dry ingredients. Fold gently with spatula just until combined; avoid overmixing to prevent tough muffins.
05 - Toss raspberries with 1 tablespoon flour in small bowl. Gently fold floured berries into batter until evenly distributed.
06 - Divide batter among prepared muffin cups, filling each about 3/4 full. Use ice cream scoop for consistent portioning.
07 - Bake 18-22 minutes until toothpick inserted in center comes out clean or with few moist crumbs. Rotate pan halfway through for even baking.
08 - Let muffins cool in pan 5 minutes. Remove from pan and transfer to wire rack to cool completely before serving.