Preheat your oven to 375°F (190°C) and prepare your muffin tin.
In a large mixing bowl, whisk together the dry ingredients: flour, baking powder, baking soda, salt, granulated sugar, and brown sugar.
In another bowl, mix the wet ingredients: melted butter, eggs, vanilla extract, and buttermilk until smooth.
Pour the wet ingredients into the dry ingredients and stir until just combined.
Gently fold in the fresh blueberries.
Divide the batter evenly among the muffin cups, filling each about 3/4 full.
Bake for 18-22 minutes or until a toothpick comes out clean.
Let the muffins cool in the pan for 5 minutes before transferring to a wire rack.