1-Soak the raisins: Begin by soaking the raisins in boiling water for 10 minutes, then drain them well to keep them plump. This simple trick ensures they add moisture and sweetness without drying out.

2-Preheat and prepare: Next, preheat your oven to 400 degrees Fahrenheit and prepare a 12-cup muffin pan with paper liners or cooking spray. In a large bowl, whisk together the 1 ¾ cups all-purpose flour, 2 ½ teaspoons baking powder, ½ teaspoon salt, ½ teaspoon ground cinnamon, ½ cup packed light brown sugar, and ¼ cup granulated sugar to blend the dry ingredients evenly.

3-Mix and bake: In a separate bowl, whisk together the ⅓ cup melted unsalted butter, 1 large egg, 1 teaspoon vanilla extract, and ¾ cup whole milk until smooth. Pour this mixture into the dry ingredients and fold gently until just moistened, then stir in the soaked raisins. Divide the batter evenly among the muffin cups, sprinkle with the topping made from 2 tablespoons light brown sugar and ½ teaspoon ground cinnamon, and bake for 18 to 20 minutes. Once done, let the muffins cool on a wire rack for the best texture and taste.