Prepare Mushrooms: Clean the mushrooms and slice them thinly. Portobello mushrooms should have their stems removed, while shiitake mushrooms can be used whole.
Make Marinade: In a bowl, whisk together soy sauce, maple syrup, apple cider vinegar, smoked paprika, garlic powder, and black pepper.
Marinate: Place the mushroom slices in the marinade, ensuring they are well coated. Marinate for at least 30 minutes, or for better flavor absorption, overnight in the refrigerator.
Oven Preparation: Preheat your oven to 200°F (93°C). Line a baking sheet with parchment paper and lightly spray with olive oil.
Arrange Mushrooms: Lay the marinated mushrooms on the prepared baking sheet in a single layer.
Bake: Place in the oven and bake for 1 to 2 hours, turning the mushrooms occasionally, until they are dry and chewy.
Cool and Enjoy: Let the mushroom jerky cool completely before serving. Store in an airtight container.
