Preheat oven to 350 degrees, spray muffin tin with nonstick cooking spray OR line with muffin wrappers
Add oats, ground flaxseed, baking powder, baking soda, cinnamon and salt to high-speed blender and blend on high until the mixture has broken down into the consistency of a fine flour (about 15 seconds)
Add the remaining ingredients except the chocolate chips and process on high until you create a smooth batter (about 30 seconds), scrape the side of the blender as needed
Spoon or pour batter into muffin tin, filling each cavity about 3/4 of the way
Sprinkle desired amount of chocolate chips on top of each muffin
Bake for 18-20 minutes, the tops should be a golden brown
Let muffins cool in the pan for 10-15 minutes