Make extra servings of these four-ingredient cinnamon and sugar crisps–they're guaranteed to go quickly.
Cut the tortillas into 1/2-inch-thick strips. Heat the butter and sugar in a large nonstick skillet over medium-low heat. When the butter has melted, add the tortilla strips. Cook, stirring frequently, until the tortillas are lightly browned and crisp, about 5 minutes. Sprinkle with the cinnamon. Serve with the ice cream (if desired).