Prepare the schnitzel and the bread and set aside. Add cheese on top of the schnitzel if you like.
Cut the bread in half. Spread beans on the bottom half and avocado on the top half.
Slice the schnitzel and lay the pieces on the beans.
Slice the tomato and place it on the schnitzel.
Put the top half of the bread on everything and enjoy. You can also add a few slices of onion.
If you like it spicy, add some chipotle sauce or sliced jalapeños.