Preheat the oven to 375℉/190℃ and line a muffin tin with 12 liners, set aside.
Add flour, oats, baking soda, baking powder, cornstarch, cinnamon, nutmeg, cloves, ginger, allspice, and salt into a bowl. Mix to combine and set aside.
1 3/4 cups all purpose flour, 1 1/2 cups rolled oats, 1 tsp baking soda, 1 1/2 tsp baking powder, 1 1/4 tsp ginger, 1 1/4 tsp cinnamon, 2 tsp cornstarch, 1/4 cloves, 1/8 nutmeg, 1/4 tsp salt, 1/8 allspice
In a large bowl, add the brown sugar, oil, eggs, vanilla, milk, sour cream, maple syrup, and molasses. Whisk well to combine (2-3 minutes) and set aside.
3/4 cups dark brown sugar, 1/3 cup maple syrup, 2 tbsp molasses, 2/3 cups oil, 3/4 cups milk, 1/2 cup sour cream, 2 large eggs, 1 tbsp vanilla
Combine the dry and wet ingredients together until a soft muffin batter forms. Do not over-mix.
Scoop evenly between the liners, I like using a cookie scooper for this to minimize the mess! Sprinkle white sugar on top (optional).
Bake for 22-28 minutes or until a toothpick inserted comes out clean. Allow to cool, and enjoy!