For an extra layer of flavor, consider adding a pinch of smoked paprika to the ground beef mixture. Feel free to customize the toppings with your favorite taco fixings, such as diced tomatoes, avocado, or a sprinkle of cilantro. If you don't have a cookie cutter, use a knife to cut the tortillas into rough circles or squares; they will still taste delicious! These mini quiches can be prepared ahead of time and reheated before serving. Store them in an airtight container in the refrigerator for up to 3 days.