Here are some ways to heat up tortillas:

1. In a skillet: Heat a skillet over medium-high heat. Place the tortilla in the skillet and cook for about 30 seconds on each side or until it is heated through.

2. In the oven: Preheat your oven to 300 degrees Fahrenheit. Wrap your tortillas in aluminum foil and place them in the oven for 10-15 minutes until fully heated through.

3. In the microwave: Place a damp paper towel over the tortillas and microwave them for 15-20 seconds.

4. On an open flame: Hold the tortilla with tongs and place it over an open flame for about 30 seconds on each side or until it is heated through.