Ultimate Slow Cooker Chicken with Creamy Mushroom Sauce

Ingredients

• 4 boneless, skinless chicken breasts (about 1.5 lbs / 680 g)
• 1 teaspoon salt (5 g)
• ½ teaspoon black pepper (2 g)
• 1 teaspoon garlic powder (3 g)
• 1 tablespoon olive oil (15 ml)
• 1 cup (150 g) sliced mushrooms (button or cremini)
• ½ onion, finely chopped (about 75 g)
• 3 cloves garlic, minced
• 1 cup (240 ml) chicken broth
• 1 teaspoon dried thyme (1 g)
• 1 teaspoon dried parsley (1 g)
• ½ cup (120 ml) heavy cream
• ¼ cup (30 g) grated Parmesan cheese
• Fresh parsley, chopped (optional)