In a food processor, pulverize oats until a flour forms. Place flour in a large mixing bowl and add in baking powder, arrowroot, sugar and salt. Mix to combine.

In a separate bowl, whisk eggs, almond milk, vanilla, and melted butter. Add wet ingredients to the dry ingredients and mix well. Let batter rest for 5 minutes or so.

Preheat waffle iron and spray lightly with cooking spray.

Using a 1/3 cup measuring cup, pour waffle batter onto hot waffle iron and cook until the outside is crispy and the inside is cooked. Place waffle on a cooling rack.

Continue with the remainder of the waffles.

To freeze - allow waffles to cool completely, then place them flat in large ziplock bags and store in your freezer. To heat, simply toast waffles from frozen.