In your blender or food processor, combine the old-fashioned oats and dry roasted cashews. Blend until you achieve a fine flour consistency.
In a mixing bowl, whisk together the melted coconut oil, milk, eggs, maple syrup, and vanilla extract (if using). Make sure everything is well combined.
In another bowl, mix the oat and cashew flour with baking powder, salt, cornstarch (or arrowroot powder), ground cinnamon, and nutmeg.
Gradually add the dry mixture to the wet ingredients, stirring until just combined. Let the batter sit for about 5 minutes to thicken slightly.
Preheat your waffle iron according to the manufacturer’s instructions.
Lightly grease the waffle iron with coconut oil or cooking spray. Pour the recommended amount of batter onto the hot surface and cook according to your waffle iron's instructions, usually for about 4-6 minutes.
Once the waffles are golden brown, carefully remove them with a spatula. Top with fresh raspberries, a drizzle of maple syrup, and a sprinkle of flax seeds for added nutrition. Enjoy your healthy breakfast!