Combine first 10 ingredients in a saucepan.
Bring to a boil over medium heat, stirring occasionally.
Reduce heat; simmer 8 minutes or until potato is done, stirring occasionally.
Remove from heat.
Cool.
Preheat oven to 400 degrees.
Place 2 baking sheets in oven for about 10 minutes.
Drain meat mixture in a colander over a bowl.
Discard liquid.
Finely chop meat mixture with a knife, or place in a food processor, and pulse 2 times or until finely chopped.
Combine cornstarch and water, stirring with a whisk.
Working with one won ton wrapper at a time (cover the remaining won ton wrappers with a damp towel to keep them from drying), spoon 1 tbsp beef mixture into center of each wrapper.
Moisten the edges of each wrapper with the cornstarch mixture.
Bring 2 opposite corners together.
Pinch the points to seal, forming a triangle.
Place filled wrapper on a wire rack.
Repeat the procedure with the remaining beef mixture, won ton wrappers, and cornstarch mixture.
Remove the baking sheets from the oven; coat baking sheets with cooking spray.
Arrange the empanadas in a single layer on baking sheets.
Coat the empanadas with cooking spray.
Bake at 400 degrees for 8 minutes or until golden, turning once.
Garnish with cilantro.