01 -
Place fresh or frozen diced onions and olive oil into a slow cooker. Cook on high for 5-6 hours, or on low overnight. Store in a closed container if making in advance.
02 -
Add drained mushrooms to the slow cooker with the cooked onions and stir.
03 -
Place chicken breasts into the slow cooker and sprinkle with garlic salt and oregano. Cover and cook on low for 3-4 hours, until the chicken reaches an internal temperature of at least 165°F.
04 -
Remove the chicken from the slow cooker and shred it with two forks. Return the shredded chicken to the slow cooker and mix it with the onions and mushrooms. Cook on low for an additional hour, then switch to warm until ready to serve.
05 -
Cut open the hoagie rolls and fill with the chicken mixture. Top with your choice of cheese. Place in the broiler for about 5 minutes to melt the cheese. Close the sandwich and serve!.
06 -
Enjoy your delicious and easy Lazy Slow Cooker Chicken Cheesesteak Sandwich!.