Preheat your oven to 350°F. Line a 4x8" baking pan with parchment paper. Then spray lightly with non-stick cooking spray. If grinding your own oat flour, measure about 1/2 cup of oats and grind them in your blender.
Add the wet ingredients to a medium-sized mixing bowl, including eggs, pumpkin puree, honey, greek yogurt, and vanilla extract. Mix with a whisk until well blended.
Add the dry ingredients to the mixing bowl, including almond flour, oat flour, pumpkin pie spice, cinnamon, baking soda, and salt. Mix with a whisk until well blended.
Add almost all of the chocolate chips. Gently mix with a spatula until all the ingredients are evenly distributed.
Pour the batter into your prepared pan. Sprinkle remaining chocolate chips on top. Bake for 50-55 minutes or until a toothpick comes out clean.
Allow to cool before slicing.