Crispy Mushroom Sandwich with Chipotle Green Onion Aioli (vegan, gluten-free)

white button mushrooms (, thinly sliced with stems)

cremini mushrooms (, thinly sliced with stems)

shitake mushrooms (, thinly sliced with stems)

cooking oil

teasp garlic powder

freshly ground black pepper

salt

slices bread (, sourdough, sprouted-wheat, gluten-free, etc.)

slices tomato

large avocado (, thinly sliced lengthwise )

leaves romaine lettuce

Chipotle Green Onion Aioli

vegan butter (, such as earth balance)