01 - Preheat oven to 375°F (190°C). Line a 12-cup muffin tin with paper liners or grease lightly.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
03 - In a separate bowl, whisk eggs, melted butter, milk, and vanilla extract until smooth.
04 - Pour wet ingredients into dry ingredients and gently mix until just combined. Avoid overmixing.
05 - Gently fold in strawberries and rhubarb until evenly distributed throughout batter.
06 - Divide batter evenly among prepared muffin cups, filling each about three-quarters full.
07 - Sprinkle tops with turbinado sugar if desired.
08 - Bake for 22 to 25 minutes until a toothpick inserted into center comes out clean.
09 - Allow muffins to cool in pan for 5 minutes, then transfer to wire rack to cool completely.