INGREDIENTS
3 Tbsps
butter
2 tsps
olive oil
4 larges
yellow onions
1/4 tsp
black pepper
2 sprigs
fresh thyme
3 cloves
garlic
1 Tbsp
balsamic vinegar
2/3 cup
reduced sodium beef broth
4
skinless boneless chicken breasts
1/2 tsp
kosher salt
1/2 tsp
black pepper
1/2 tsp
dried thyme
1 tsp
garlic powder
1 cup
shredded mozzarella
1/3 cup
parmesan