Open package of seaweed snacks, and cut the sheets in half. In three batches, blend the seaweed in an electric spice grinder until they are small flakes. Pour into a small bowl.
To the small bowl, add Parmesan cheese powder, nutritional yeast, lemon pepper seasoning, garlic powder, and mustard powder. Mix well, using a fork. Use the tines of the fork to break up clumps, and fluff until the powder is well-combined and the texture of coarse sand. Taste and adjust salt, as needed.
