Spray a saute pan or skillet with nonstick spray, or use a little oil, and place on the stove over medium heat to cook onion until it is translucent. Add the garlic and cook another minute.
Add the chipotle, cream cheese, and pepper jack cheese and cook until it is melted and combined. Add the chicken and corn and heat for 2 minutes.
Remove from the heat and add the cilantro.
Roll out the pie crust and use a large circle cutter or turn a bowl upside down and cut around it with a knife.
Place a large spoon of chicken filling in the middle of each pastry dough circle. Pull up the two sides of the circle and pinch the sides together, then use a fork and crimp the edges to seal well.
Brush the tops with egg white.
Place the empanadas in the oven and bake until they are golden brown, about 18 to 20 minutes.
Serve with sour cream and salsa.