Heat oven to 425° F. Put the tortillas on a baking sheet and
place in the oven to warm. (Cover with foil if you don't like
crisp tortillas.) Toast the cumin in a small, dry saucepan over
medium heat until aromatic, about 3 minutes. Add the beans and
chipotle or crushed red pepper (if using). Remove the tortillas
from the oven. Spoon some beans onto each tortilla, then top each
with some salsa, 1 fried egg, and some cheese. Bake until the
cheese has melted. Serve with the avocado.