Preheat your waffle iron according to the manufacturer's instructions.
In a large bowl, whisk together the almond flour, oat fiber, whey protein powder, baking powder, and kosher salt until evenly combined.
In a medium bowl, whisk the almond milk, eggs, vanilla extract, and melted cooled butter until smooth.
Pour the wet ingredients over the dry ingredients and stir until just combined. Let the batter rest for 5 minutes; it will thicken slightly.
Pour about 1/4 cup of batter per waffle onto the hot waffle iron (adjust amount for your iron). Cook according to your waffle iron's directions until golden and cooked through.
Remove waffles carefully and serve with desired toppings.