Easiest Slow Cooker Chicken Breast with Gravy Ever

Ingredients

• 4 boneless, skinless chicken breasts (about 6-8 oz each)
• 1 tablespoon olive oil
• 1 teaspoon dried thyme
• 1 teaspoon dried rosemary
• 1/2 teaspoon garlic powder
• 1/2 teaspoon onion powder
• Salt and black pepper to taste
• 1 medium yellow onion, chopped
• 2 cloves garlic, minced
• 4 cups chicken broth
• 2 tablespoons all-purpose flour
• 2 tablespoons butter
• 1 teaspoon Worcestershire sauce
• 1/4 cup heavy cream (optional)
• 2 Bay leaves