To make cheese shells on the stovetop, start with shredded cheese (cheddar or mozzarella works well). Heat a non-stick pan over medium heat and sprinkle a thin layer of cheese in the pan. Once the cheese begins to melt and bubble, use a spatula to carefully lift the edges of the cheese and fold it over into a shell shape. Cook for another 30 seconds to a minute, then carefully remove from the pan with tongs or a spatula and place on parchment paper to cool and harden. Repeat with remaining cheese, adjusting the heat as needed to prevent burning. Enjoy as a crispy, low-carb base for tacos, salads, or as a snack!