Baking rather than frying the tortillas gives these a crispier texture.
Heat oven to 350 degrees. In a small bowl, combine sugar and cinnamon; set aside. Cut tortillas into 2 1/2-inch-wide strips. Lay strips in a single layer on a baking sheet, brush with melted butter, and sprinkle with sugar mixture. Bake until golden, 10 to 15 minutes. Repeat with remaining tortillas. Serve with vanilla ice cream.