Cheesy Chicken, Broccoli, and Brown Rice Slow Cooker Casserole

Ingredients

• 1 pound boneless, skinless chicken breasts
• 1 small onion, chopped
• 1 cup water
• 1/8 teaspoon pepper
• 1/2 teaspoon garlic powder
• 1 cup grated cheddar cheese
• 1/2 cup plain Greek yogurt
• 1/4 teaspoon dried thyme
• 1 tablespoon Dijon mustard
• 1 pound broccoli, cut into small pieces (4-5 cups)
• 1/2 cup grated Parmesan cheese
• 1/2 teaspoon salt
• 2 cups low sodium chicken broth
• 1 cup brown rice, rinsed and drained