Spray the two Mountain Pie Irons well with cooking spray.
Roll out the crescent dough and separate into 4 squares, 2 triangles each. Gently press 2 of the squares into the bottom half of each pie iron. Divide the vegetable mixture between each pie iron. Layer the chicken on top of the vegetable mixture. Top the chicken with the remaining 2 crescent dough squares, pressing the dough to seal well. Trim the excess dough from around the outside of the mountain pie iron.