INGREDIENTS
1/4 cup
chopped onion
1/4 cup
barbecue sauce, divided
2 tbsp
dry breadcrumbs
2 tsp
prepared mustard
3/4 tsp
chili powder
1/2 tsp
garlic powder
1/4 tsp
salt
1 lb
ground turkey
Cooking spray
4
large leaf lettuce leaves
4
(1/4-inch-thick) slices tomato
4
hamburger buns