Preheat the oven to 350 degrees Fahrenheit. Grease an 8x8 baking pan with coconut oil and line with parchment paper.
In a medium bowl, combine oat flour, baking powder, salt, and cinnamon. In a large bowl, cream coconut oil, cane sugar, and coconut sugar together with a hand mixer until light and fluffy. Mix in flax eggs, followed by vanilla extract.
With the hand mixer on low, add in the dry ingredients. Mix until combined. Stir in the whole oats until evenly combined, and lastly, fold in the chocolate chips.
Press batter into prepared pan. Use an extra piece of parchment paper to press and pack into an even layer. Be sure to firmly pack down into pan. Bake for 30 to 32 mins or until the top is golden brown and a toothpick comes out clean.
Allow bars to cool completely in pan on a wire rack. When cool, use a sharp knife to cut into bars. Store in an airtight container.