Chicken Mango Lettuce Wraps

Name: Chicken Mango Lettuce Wraps
Ingredients: 1 pound ground chicken (I use ground chicken thighs for more flavor); 2 teaspoons soy sauce (use gluten-free soy sauce if cooking gluten free); 1 teaspoon cornstarch (or potato or rice starch); 1 teaspoon cooking oil (peanut oil or canola); 2 green onions , chopped; 4 ounces fresh shiitake mushrooms , sliced; 2 teaspoons seasoned rice vinegar; 1/2 teaspoon toasted sesame oil; 1 large mango , diced (see How to Cut a Mango ); 1 head butter lettuce , rinsed, leaves separated