Cook the chicken. Heat 1–2 tbsp olive oil in a skillet. Cut chicken into bite-size chunks, season generously, and cook 7–10 minutes until done.
Prepare rice and broccoli. Cook instant rice and broccoli according to package directions while the chicken cooks.
Make the sauce. In the same skillet, sauté garlic for 1 minute. Stir in broth, cream of chicken, heavy cream, sour cream, garlic & herb seasoning, and 1 cup cheese. Simmer until slightly thickened.
Assemble casserole. In a large bowl, combine chicken, broccoli, rice, and sauce. Season with salt and pepper to taste if necessary. Spread half into a greased baking dish, sprinkle with cheese, add remaining mixture, and top with more cheese.
Bake. Bake uncovered at 375°F for 25 minutes until hot and bubbly. Garnish with parsley and enjoy!