Heat the olive oil over medium-high heat and add the onions. Cook 5-7 minutes, or until they soften. Add the Field Roast and cook over medium heat until heated through, again, for 5-7 minutes.
On a warmed tortilla, layer on some sour cream, Field Roast mixture, avocados, and any other burrito fillings you want. Roll up and enjoy!
Recipe by Epicurean Vegan at http://epicureanvegan.com/2013/03/19/field-roast-and-avocado-burritos/