Preheat and prep: Preheat the oven to 425°F. Line a muffin pan with 12 paper liners.
Mix dry ingredients: In a medium bowl, combine the flour, cinnamon, baking powder, baking soda, nutmeg, and salt, and whisk together.
2 cups all-purpose flour, 1 Tbsp. ground cinnamon, 2 ½ tsp. baking powder, 1/2 tsp. baking soda, 1/2 tsp. ground nutmeg, 1/2 tsp. salt
Mix wet ingredients: In another large bowl, combine the sugar, oil, sour cream, eggs, and vanilla, and whisk well.
3 large eggs, 1 cup granulated sugar, 3/4 cup vegetable oil, 1/2 cup full-fat sour cream, 2 tsp vanilla extract
Combine wet and dry: Add the dry ingredients to the wet ingredients. Fold just a few times.
Add carrots: fold in the grated carrots until no flour streaks remain, being careful not to overmix.
~2 large carrots
Scoop into muffin tin: Divide the batter among the paper liners (they will be almost full, you’ll get 12 muffins perfectly). Sprinkle the tops with sanding sugar/turbinado sugar, if you like.
Bake: Bake for 5 minutes at 425°F Start Timer and then, without opening the oven, reduce the oven temperature to 350°F and bake for another ~14-15 minutes Start Timer, or until the tops are springy and a toothpick comes out with a few crumbs. Let cool for 5 minutes in the pan, then transfer to a cooling rack to cool completely. Start Timer