Preheat your oven to 375°F. Line a muffin tin with paper liners or lightly grease with cooking spray.
Make Streusel Topping : In a small bowl, combine the light brown sugar, granulated sugar, ground cinnamon, and blend with a fork. Add the melted butter and mix until combined. Stir in the all-purpose flour using a fork and mix until the topping is thick and crumbly. Break up large crumbles into smaller ones so that they will stay on top of the muffins. Set aside.
3 tablespoons packed light brown sugar, 2 tablespoons granulated sugar, ½ teaspoon ground cinnamon, 3 tablespoons butter, 1/2 cup all-purpose flour
Peach Muffin Batter : In a medium mixing bowl, whisk together all-purpose flour, light brown sugar, granulated sugar, baking powder, ground cinnamon, kosher salt, and ground nutmeg.
2 cups all-purpose flour, 3/4 cup packed light brown sugar, 1/4 cup granulated sugar, 2 teaspoons baking powder, 1 ½ teaspoons ground cinnamon, 1 teaspoon kosher salt, ¼ teaspoon ground nutmeg
In another mixing bowl, beat the egg with a whisk. Add in then mix in the milk, vegetable oil, and vanilla extract. Whisk until combined.
1 large egg, 3/4 cup 2% milk or whole milk, 1/2 cup vegetable oil, 1 ½ teaspoon pure vanilla extract
Pour the wet ingredients into the dry ingredients and mix gently with a rubber spatula just until combined. Avoid overmixing.
Gently fold the chopped peaches into the batter.
1 can (15 oz) peaches
Bake Muffins : Divide the batter evenly among the prepared muffin cups, filling each about ¾ full. Sprinkle some streusel topping over each muffin.
Bake for 18-20 minutes or until a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the pan for 5 minutes, then transfer them to a wire rack to cool completely.
Make The Glaze : In a mixing bowl, whisk together the powdered sugar, heavy cream, and vanilla extract. Drizzle the glaze over the cooled muffins using a piping bag/Ziploc bag with a small hole or a spoon.
1/2 cup powdered sugar, 1-2 tablespoons heavy cream, ½ teaspoon pure vanilla extract