Preheat oven to 425°F. Line a jumbo muffin pan with large parchment baking cups.
In a medium bowl, whisk together the flour, baking powder, cinnamon, ginger, cloves, and salt.
In a large bowl, whisk together the vegetable oil, brown sugar, egg, kefir, and molasses.
Gently fold the dry ingredients into the wet ones just until the flour streaks disappear.
Fill the jumbo muffin liners evenly with batter. Sprinkle coarse sugar over the tops (optional).
Bake on the middle rack at 425°F for 5 minutes, then lower the temperature to 350°F without opening the oven door. Continue baking until a toothpick comes out clean (about 15-20 more minutes; 20-25 minutes total).
Let the muffins cool in the pan for about 10 minutes, then transfer to a cooling rack.
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Notes
Storage: Store cooled gingerbread muffins at room temperature for 1 week or in the freezer for 2 months.Mini Muffins: Bake at 350°F for about 10-15 minutes.Regular Muffins: Fill regular muffin liners ¾ full and follow the same baking instructions as written. They make take less time to bake.Lifeway Kefir: This recipe is sponsored by Lifeway Foods. All opinions are my own and I genuinely love their foods and mission! If you can't get your hands on their kefir, you can substitute it with an equal amount of buttermilk.