This cheesy, spicy gluten-free nacho cheese dip recipe is thickened with amaranth. Many store brands are thickened with gluten, making them inedible for people with gluten sensitivities or allergies. This dip is also seasoned with homemade gluten-free taco seasoning. Serve this dip warm with gluten-free tortilla chips for a great half-time, or anytime, snack. If you are serving this for a crowd, do let them know that it's a gluten-free recipe, but not dairy-free. If you want to make this dip dairy-free, you can substitute the milk for your favorite dairy-free milk substitute, as long as it is unsweetened. You can also substitute the cheddar cheese for dairy-free cheese and the butter for olive oil or margarine. Follow the recipe as is and stir it until a smooth consistency is reached. The recipe calls for amaranth flour or sweet rice flour. These ingredients are common flour substitutes and can be found in the baking or organic foods aisle of most grocery stores. If you can't find them there, try a health food store or order the ingredients online.