Sauté the onions in the olive oil over medium heat until soft and slightly browned. (about 8 minutes)
Lightly oil the bottom of your slow cooker and place the chicken breast in an even layer on the bottom.
Add the mushrooms, onions and garlic to the slow cooker.
Pour the broth into the slow cooker. (I used half chicken broth, half mushroom stock)
Add the salt, pepper, garlic powder, onion powder and thyme.
Cover and cook on high for 3-4 hours.
Chicken should be falling apart. Shred chicken.
Stir in the heavy cream. (optional)
Serve & Enjoy!