In a medium heated skillet add olive oil, onions, and garlic. Saute until slightly translucent, add meat, lime juice, serrano pepper, chili powder, oregano, salt/pepper, and cumin. Cook to your liking(medium-rare etc).
Place wheat thin round halves on a cookie sheet and heat in oven until crisp.
Add asada strips on each halve with ricotta cheese, avocado, and serve.