Since this chicken taco casserole is already loaded with protein, carbs, and fats, making it a complete meal on it's own, I like to pair it with a simple side salad. Opt for fresh romaine or mixed greens and a homemade vinaigrette to help lighten up the overall meal. This spinach, goat cheese, and walnut salad with raspberry vinaigrette, kale and crispy chickpea caesar salad, or this greek salad with feta vinaigrette are a great place to start. I also like to pair heavier casserole dishes with roasted vegetables, as well.