Give beef a rest and try chicken for burgers instead. Simply combine chicken breasts, capers, shallots, salt, and pepper in a food processor, shape into patties, and cook in a grill pan. If you need to speed up your weeknight cooking, make these patties in advance. Line a cookie sheet with freezer paper, arrange uncooked patties in a single layer on the pan, and freeze until firm. Wrap each frozen burger in freezer paper or aluminum, and store until you need them. Like beef burgers, take out as many as you need, thaw in the fridge overnight or while you're at work, and you'll be able to have a simple sandwich in just minutes when you get home.
How to Make It
Combine first 5 ingredients in a food processor; process until finely ground. Divide chicken mixture into 4 equal portions; shape each into a 1/2-inch-thick patty. Heat a large grill pan over medium-high heat. Coat pan with cooking spray. Add patties to pan; cook 5 minutes on each side.
Place bottom half of each bun on a plate, and spread 1 tablespoon mayonnaise over each. Top each burger with 1 lettuce leaf, 1 patty, and 2 tomato slices. Spread 1 1/2 teaspoons mustard over each bun top, then top burgers.