Toast chilis in your oven’s broiler for a few minutes to get them roasted. Then soak in water for at least 15 minutes. Blend chilis and water into a blender to form a paste. If too thick, add more water. If too liquid, add more chilis.
Add all ingredients for vegan nacho cheese to a blender and blend until smooth. Add water to reach desired consistency (not too thick or too runny).
Place all ingredients for mushroom Oaxacan cheese sauce into a pot and bring to a simmer for about 10 minutes or until all ingredients flavors have infused.
Set your oven’s broiler to high. Place Oaxacan cheese in a hot iron skillet or oven-friendly dish and top with mozzarella cheese. Place in oven until the top is light brown and crisp. Garnish with green onions (optional) and serve with chips or soft tortillas.
