1. to prepare patties, place pinto beans in a medium bowl; partially mash with a fork. add cheese and next 5 ingredients (through egg white); stir until well combined. Shap bean mixture into 4 (1/2 inch-thick) oval patties.
2. Heat oil in a large nonstick skillet over medium-high heat. add patties to pan; cook 3 minutes on each side or until patties are browned and thoroughly heated.
3. to prepare spread, combine avocado and next 5 ingredients (through salt), stirring well. place 1 patty in each pita half. spread about 2 Tbsp avocado spread over patty in each pita half; top with onions and greens.
*serving size: 1 stuffed pita half