Method

1. Preheat oven to 350 degrees. 
2. Add the pumpkin purée, Greek yogurt, eggs, and vanilla extract to a mixing bowl and stir until well combined. 
3. Next, add in the brown sugar and stir until well mixed.
4. Add in the oat flour, baking soda, and pumpkin pie spice and stir until well combined. Next, fold in the chocolate chips.
5. Transfer the batter to a greased muffin tin. Fill each muffin well two-thirds of the way full.
6. Bake the muffins at 350 degrees for 15 to 20 minutes or until a toothpick, placed in the center, comes out clean.
7. Serve the muffins warm, straight out of the oven, or enjoy them the next day!