In a large bowl, combine the first 9 ingredients. Transfer to a 15x10x1-in. baking pan. Bake at 425°until potatoes are tender, 24-28 minutes., In a small bowl, combine cheeses. Spread 1/3 cup vegetable mixture over half of each tortilla. Sprinkle with 1/4 cup cheese; fold tortillas to close. Cook in a greased cast-iron skillet or griddle over low heat until cheese is melted, 1-2 minutes on each side.