Heat oven to 400 degrees Fahrenheit. Line 12 standard (1/3 cup) muffin cups with paper liners.
In a large bowl, mix together the flour, 1 cup oats, baking powder, baking soda, salt, cinnamon, ginger, cloves, and nutmeg. In a medium bowl, whisk together the buttermilk, pumpkin, granulated sugar, brown sugar, oil, egg, and vanilla.
Add the wet ingredients to the dry ingredients, whisking just until the ingredients are incorporated. Divide batter between the 12 muffins cups. Divide 2 tablespoons oats between the 12 muffins, sprinkling a few evenly over each.
Bake for about 15 minutes, until the top of the muffins spring back when poked and a toothpick inserted into the center of one of the muffins comes out clean.