In a bowl, combine all the ingredients for the steak spices. (You can double or triple the portion to prepare more for other recipes)
10 button mushrooms, 1 tbsp. steak spices, 2 tablespoon paprika, 2 tablespoon freshly ground black pepper, 2 tablespoon sea salt, 1 tablespoon garlic powder, 1 tablespoon onion powder, 1 tablespoon crushed coriander seeds