In a medium bowl, combine the shredded cooked chicken, taco seasoning, and water. Mix well until the chicken is evenly coated.
Stir in the shredded cheddar cheese into the chicken mixture.
Warm the corn tortillas. You can do this by wrapping them in a damp paper towel and microwaving for 30-60 seconds, or by briefly heating them in a dry skillet.
Lay out a warm tortilla. Spoon about 2 tablespoons of the chicken mixture onto the center of the tortilla.
Roll up the tortilla tightly to form a taquito shape.
Place the rolled taquitos seam-side down on a baking sheet.
Brush the tops and sides of the taquitos with vegetable oil.
Bake for 20-25 minutes, or until the taquitos are golden brown and crispy, flipping halfway through for even crisping.
Serve hot with your favorite toppings such as sour cream, salsa, or guacamole.
Notes
For an extra crispy taquito, you can spray them with cooking spray before baking.