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1
Combine mushrooms, costeño chile pieces, garlic, yerbasanta, and water in a blender. Work in stages to reach a loose, coarse consistency — do not over-process to a smooth paste. Season with salt.
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2
Heat a clay comal over medium-high heat (approximately 200–220°C / 390–430°F) without adding any fat.
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3
Lay a raw tortilla flat. Spoon filling onto one half, leaving a border. Scatter grated dry cheese over the filling.
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4
Fold the empty half of the tortilla over the filled half, pressing the edge lightly to enclose.
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5
Transfer to the hot comal. Cook until the masa is set, dry, and lightly blistered on the underside, then flip and cook the second side through. Serve immediately.