Preheat Oven: Preheat your oven to 200°F (93°C) to keep the flautas warm while you fry them. This ensures they stay crispy.
Heat Oil: In a large frying pan, heat vegetable oil over medium-high heat until it reaches 375°F (190°C). Use a thermometer to check the temperature for perfect frying.
Prepare the Filling: In a mixing bowl, combine 3 cups shredded cooked chicken, 1 cup shredded Mexican blend cheese, ½ cup salsa, and 1 can diced chiles. Season with garlic salt and pepper to taste and mix well.
Assemble Flautas: Take a 12 flour tortillas and fill each tortilla with about 2-3 tablespoons of the chicken mixture. Roll each tortilla tightly and secure it with toothpicks to hold the shape.
Fry the Flautas: Carefully place the rolled flautas in the hot oil, cooking until golden brown, about 2 minutes on each side. Use tongs to turn them for even cooking.
Drain and Keep Warm: Remove the flautas from the oil and let them drain on a paper towel to remove excess oil. Place them in the preheated oven until ready to serve.
Serve: Once all the flautas are fried, remove toothpicks and serve hot with your choice of toppings like shredded lettuce, chopped tomatoes, green salsa, guacamole, and cilantro ranch dressing.