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Line a standard 9x5in loaf pan with parchment paper. Place oat flour, flax, protein powder, and salt in a mixing bowl. Whisk until combine.
Add peanut butter, honey, and vanilla (and 1 tbsp coconut oil if using vegan protein per note below). Use a spoon (I like to use my hands here!) to mix until fully combined. Taste and make sure the texture is right (you can also add a splash of milk if needed).
Dump mixture into pan and press down very firmly until it's smooth and flat. Sprinkle with flaky salt and press in a handful of chocolate chips if desired.
Freeze for at least 30 minutes before cutting into 8 bars. I like eating these right out of the freezer! You can store them there (I use this silicone bag) or in the fridge.