Preheat a waffle iron according to manufacturer’s instructions; spray the inside with cooking spray.
Whisk almond milk, applesauce, egg, chia seeds, and vanilla extract together in a bowl; let sit until chia seeds start to thicken the mixture, about 2 minutes. Whisk flour, oats, flax seed meal, baking powder, sugar, and salt into almond milk mixture until batter is smooth.
Scoop 1/2 cup batter into the preheated waffle iron and cook until crisp and golden, about 5 minutes per waffle. Repeat with remaining batter.
These waffles freeze beautifully. Spray a baking sheet with cooking spray. Flash-freeze the waffles for 30 minutes. Place frozen waffles in a freezer bag. Toast individual frozen waffles in a toaster oven for 5 minutes.
Before serving, place cooked waffles on paper towels to avoid sogginess.
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