Preheat your oven to 375°F (190°C) and line a muffin tin with paper liners.
In a large bowl, whisk together the all-purpose flour, whole wheat flour, granulated sugar, brown sugar, baking powder, baking soda, and salt.
In a separate bowl, combine the melted butter, buttermilk, eggs, and vanilla extract. Mix well.
Pour the wet ingredients into the dry ingredients and stir until just combined.
Gently fold in the chopped strawberries.
Divide the batter evenly among the prepared muffin cups, filling each about two-thirds full.
Bake in the preheated oven for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
Remove from the oven and let the muffins cool in the pan for 5 minutes.
Transfer the muffins to a wire rack to cool completely.
Enjoy your fresh strawberry muffins warm or at room temperature!