Divide beef into 2 equal portions, shaping each into a 1/2-inch-thick patty. Rub olive oil on both sides of patties.
Heat a nonstick skillet or grill pan over medium heat. Place patties in pan; cook 6 minutes on each side, or until a meat thermometer inserted into middle of burger registers 160ï¿½.
Combine green beans, white beans, kidney beans, carrot, bell pepper, and vinaigrette in a bowl; toss gently.
Serve burgers and a few lettuce leaves on whole-grain buns with bean salad on the side.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.