Preheat oven to 400°F (200°C). Line or grease 12 muffin cups. In a bowl, mix flour, sugars, baking powder, baking soda, and salt. Make a well in the center. In another bowl, combine butter, milk, eggs, and vanilla. Pour into the well and stir until just combined. Gently fold in blueberries. Divide batter into muffin cups, filling each about 3/4 full. Sprinkle with sanding sugar if desired. Bake for 14-18 minutes until golden and a toothpick comes out clean. Cool for 5-10 minutes before serving.

PREP TIME & NUTRITION:
Prep Time: 15 minutes, Cook Time: 18 minutes, Total Time: 33 minutes, Servings: 12, Calories: 180, Net Carbs: 25g, Fats: 7g, Protein: 3g