Preheat the oven to 400°F (200°C). Line a standard 12-cup muffin pan with paper liners. If you don’t have paper liners, generously grease the wells and tops of the pan with non-stick spray or butter.
In a large mixing bowl, whisk together the flours, baking powder, baking soda, salt, sugar, and raisins. 2 ¼ cups (270 g) all-purpose flour 2 teaspoons baking powder 1/4 teaspoon baking soda 1/2 teaspoon salt 1/3 cup (75 g) granulated sugar 1 ⅓ cups (200 g) raisins
In a small bowl or measuring cup, whisk together the egg, buttermilk, and melted butter. 1 large egg 1 cup (227g) buttermilk 6 tablespoons (85g) melted butter (or oil)
Pour the egg mixture into the flour mixture. With a wooden spoon or spatula, stir the mixture together just until the last of the flour has been incorporated. Do not continue stir or this will result in tough muffins. Batter will be stiff.
Divide the batter evenly into the prepared pan, filling the cups about 3/4 full. Batter will be mounded at the top. Sprinkle on sparkling sugar.
Bake the muffins for 18- 20 minutes, until a cake tester inserted into the center of a muffin comes out clean. Remove them from the oven. Tip the muffins in the pan, so their bottoms don't get soggy. Wait 5 minutes, then transfer the muffins to a rack to cool.