Preheat your oven to 350°F (175°C).
In a large skillet, heat the olive oil over medium heat. Add the chopped onion and cook until translucent, about 5 minutes.
Add the minced garlic and chicken pieces to the skillet. Cook until the chicken is browned and fully cooked, about 8–10 minutes. Season with salt, pepper, thyme, and paprika.
In a large mixing bowl, combine the cauliflower rice, broccoli florets, cream of chicken soup, and chicken broth. Stir in the cooked chicken mixture.
Transfer the casserole mixture into a greased 9x13 inch baking dish.
Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
Cover the baking dish with aluminum foil and bake for 30 minutes.
Remove the foil and bake for an additional 15 minutes, or until the cheese is bubbly and golden brown.
Allow to cool for a few minutes before serving.