To begin, spray a 9x9 pay with non-stick spray (or line with parchment paper). Preheat your oven to 350.
To a small mixing bowl, add your dry ingredients (oat flour, baking powder, baking soda, pumpkin pie spice, and salt) and stir till combined.
To a large mixing bowl, add your sugar, applesauce, butter and pumpkin puree and whisk them together. Then add your eggs and whisk them in briefly.
Add your dry ingredients to your wet ingredients and stir till you have a smooth batter. Add your chocolate chips and nuts and gently fold them in. Pour your batter into your and spread it into one even layer.
Bake in the oven for 25-28 minutes, or till the top is springy and a toothpick inserted comes out clean.
Let the bars cool entirely, then drizzle with chocolate and cut into pieces. Devour!
Add your chocolate chips and butter to a small, microwave safe bowl. Microwave in small increments (15-20 seconds), stirring in between, till the chocolate is melted. With a small spoon, move quickly back and forth over the bars and drizzle the chocolate across the tops.
Stored in an airtight container in the fridge these bars will last about 4-5 days.