Mini burgers with secret vegetables

Whirl mushrooms with onion and garlic in a food processor until finely chopped. Heat a large, wide non-stick frying pan over medium-high. Add 2 tsp oil, then mushroom mixture and 1/4 tsp salt. Cook until soft, about 5 min. Let cool slightly. Crumble meat into a large bowl. Stir in vegetables, egg, bread crumbs and remaining 1/4 tsp salt. Season with pepper. Heat the same non-stick frying pan over medium. Add remaining 1 tsp oil. Shape meat mixture into 6 burgers, each about 1/4 in. thick. Press a shallow depression in centre of each to help keep their shape during cooking. Add to pan and cook 3 to 4 min. Flip and cover pan. Reduce heat to medium-low and continue cooking until burgers are cooked through, 4 to 5 more min. Serve in toasted buns with your favourite toppings.