This low carb taco casserole is full of flavor, and it will be a hit with the whole familyeven cauliflower haters won't be able to say no to this casserole. The cauliflower rice takes on the bold taco flavors and blends nicely with the ground beef, salsa, and cheese. Feel free to change it up with the ingredients you have on hand. If you don't have salsa, use diced tomatoes, or make it with ground turkey or chicken instead of ground beef. Pepper jack or a mexican blend of cheeses may be used in place of the cheddar, or use a colby cheese and monterey jack blend.