01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease lightly with cooking spray.
02 - In a large mixing bowl, whisk together flour, sugar, baking powder, baking soda, and salt until thoroughly blended.
03 - In a separate bowl, whisk eggs, oil, yogurt, lemon zest, lemon juice, and vanilla extract until smooth and well combined.
04 - Pour wet mixture into dry ingredients. Using a spatula, fold gently until just combined. Stop mixing as soon as flour streaks disappear to prevent tough muffins.
05 - Place fresh raspberries in a small bowl with 1 tablespoon flour. Toss gently to coat berries lightly, which helps prevent them from sinking to the bottom.
06 - Gently fold flour-coated raspberries into the batter, taking care not to crush them.
07 - Divide batter evenly among prepared muffin cups, filling each about three-quarters full.
08 - Bake at 375°F for 18 to 22 minutes. Muffins are done when a toothpick inserted into the center comes out clean or with just a few moist crumbs.
09 - Let muffins rest in the pan for 5 minutes before transferring to a wire rack. Cool completely before storing.