Preheat the oven to 425 degrees F. Line a muffin pan with parchment cups.
In a medium bowl, combine the gluten free 1:1 flour, oats, baking powder, pumpkin spice and salt. Set aside.
In a large bowl, cream together the sugars and butter with an electric hand mixer. Mix in the eggs until fully combined.
Then, add the pumpkin purée, oil, molasses, and vanilla, and mix until well combined.
Add the dry ingredients to the wet, and use a rubber spatula to gently mix until just combined.
Divide the muffin batter between 12 muffin cups.
In a small bowl, combine the sugar and pumpkin spice, then sprinkle it on top of each.
Bake the muffins for 5 minutes, then turn the oven down to 375 and continue baking for another 15-18 minutes until a toothpick inserted comes out clean.