Banana Muffins
1 3/4 cups (245 grams) all-purpose flour 
1/2 cup (100 grams) granulated white sugar 
1/4 cup (50 grams) light brown sugar 
1 teaspoons baking powder
1/2 teaspoon baking soda 
1/4 teaspoon salt
2 ounces (65 grams) white chocolate, cut into small pieces
2 large eggs, lightly beaten
8 tablespoons (113 grams) (1 stick) unsalted butter, melted and cooled 
3 very ripe large bananas (approximately 1 pound or 454 grams), mashed well (about 1-1/2 cups) 
1 teaspoon pure vanilla extract
Garnish:
1 large banana, sliced (optional)