01 - Preheat the 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 the flour, sugar, baking powder, baking soda, and salt until thoroughly combined.
03 - In a separate medium bowl, whisk the eggs, vegetable oil, yogurt (or sour cream), lemon zest, lemon juice, and vanilla extract until smooth and well blended.
04 - Pour the wet ingredients into the dry ingredients. Using a spatula, gently fold together until just combined. Be careful not to overmix as this will result in tough muffins.
05 - Place the raspberries in a small bowl and toss with 1 tablespoon of flour. This coating prevents the berries from sinking to the bottom during baking.
06 - Gently fold the flour-coated raspberries into the batter, taking care not to crush them.
07 - Divide the batter evenly among the prepared muffin cups, filling each about 3/4 full.
08 - Bake for 18-22 minutes, or until the tops are golden and a toothpick inserted into the center comes out clean or with a few moist crumbs.
09 - Allow the muffins to cool in the pan for 5 minutes. Transfer to a wire rack and let cool completely before serving.