Creating this delightful dish is incredibly simple! Just follow these easy steps:

1. Prepare the Slow Cooker: Spray your slow cooker with a non-stick spray or coat it lightly with oil.
2. Season the Chicken: Lightly season the chicken breasts with salt and pepper on both sides.
3. Sear the Chicken: In a pan, heat olive oil over medium-high heat. Sear the chicken for 2-3 minutes on each side until golden brown (this step is optional but adds flavor).
4. Add Ingredients: Put the seared chicken breasts into the slow cooker. Add the sliced mushrooms, minced garlic, Marsala wine, and chicken broth on top.
5. Cook: Cover the slow cooker and set it to low for 4-6 hours or high for 2-3 hours, until the chicken is tender and fully cooked.
6. Shred (Optional): If you prefer shredded chicken, shred it in the slow cooker with two forks before serving.
7. Serve: Taste the sauce and adjust seasoning as needed before serving over a choice of your favorite side.

These straightforward instructions ensure that you can effortlessly create a restaurant-quality dish right in your kitchen!