Chop off the mushroom caps and carefully slice the king oyster mushrooms into about ⅙-inch thick pieces. Preheat the oven to 400°F and line a baking tray with parchment paper.
In a small bowl, combine the canola oil, maple syrup, smoked paprika, salt, and black pepper. Brush the mushroom slices evenly with the sauce on both sides.
Place the mushroom pieces on the parchment paper, leaving space between each slice to avoid crowding. Bake for 20–25 minutes, flipping halfway through. Keep a close eye on them, as cooking time may vary depending on the thickness of the slices and your oven. They’re done once the edges start to darken.
To air fry, cook at 400°F for 6–8 minutes.
Remove the mushroom bacon from the oven or air fryer and let the slices sit for at least 5 minutes to crisp up before serving.
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Notes
Feel free to adjust the ingredients to your liking. Taste the spice mix to see if it’s to your liking. For example, if you want more sweetness, add more maple syrup.