Southwest Pinto Bean Burgers

1/2 cup diced onion
1/2 cup dry breadcrumbs
1/4 cup chopped cilantro
2 tablespoons minced seeded jalapeƱo pepper
2 tablespoons reduced-fat sour cream
1 teaspoon hot pepper sauce
1/2 teaspoon ground cumin
1/4 teaspoon freshly ground black pepper
1/8 teaspoon salt
1 large egg
1 (15-ounce) can pinto beans, drained
1 (8 3/4-ounce) can no salt-added whole-kernel corn, drained
Chipotle Mayonnaise:
1/4 cup low-fat mayonnaise
1 teaspoon canned minced chipotle chile in adobo sauce

Remaining ingredients:
1 tablespoon canola oil
4 (1 1/2-ounce) whole wheat hamburger buns, toasted
4 romaine lettuce leaves

--- To prepare burgers, combine the first 10 ingredients in a large bowl. Add pinto beans and corn; partially mash with a fork. Divide bean mixture into 4 equal portions, shaping each portion into a 3 1/2-inch patty, and refrigerate for 10 minutes.
To prepare chipotle mayonnaise, combine mayonnaise and 1 teaspoon chipotle in a small bowl; set aside. Heat canola oil in a large nonstick skillet over medium-high heat. Add patties to pan, and cook 4 minutes on each side or until thoroughly heated. Assemble burgers.

Hun... What's for Dinner? adapted from Cooking for your Family via Cooking Light