Preheat oven to 400 degrees.
Using a medium-sized cup, press firmly on one corn tortilla (as close to the edge as possible) and remove the tortilla around the cup, leaving a smaller tortilla (see pictures for tutorial). Repeat until you have 18 small tortillas.
In a bowl, mash the chicken so it's shredded. Add remaining ingredients and mix well.
Place tortillas on a paper towel and warm for one minute in the microwave.
Place about a spoonful of chicken mixture inside the tortilla, and shape into a tortilla.
Put a muffin tin upside down, and place the taco in between two muffin holders (see picture) to help keep its shape.
Repeat until all tacos are formed.
Cook for 10-15 minutes, or until tortillas and chicken start to crisp and are heated throughout.