Easy Chicken Broccoli Casserole

Ingredients

• 2 cups chicken broth
• 4 cups cooked brown rice
• 2 tablespoons olive oil
• 1 pound boneless, skinless chicken breast or chicken tenders, cut into 1-inch cubes
• 2 tablespoons cornstarch or arrowroot powder
• 1 tablespoon lemon juice
• 1.5 tablespoon Dijon mustard
• 1 tablespoon dried Italian seasoning
• 1 cup chopped onion
• Black pepper, to taste
• 1 teaspoon garlic powder, divided
• 3/4 cup shredded cheddar cheese
• 1 teaspoon salt, divided
• 16 ounces frozen broccoli florets