Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the cream cheese and half of the salsa. Mix until smooth. Then, add in the thawed spinach and shredded chicken. Stir until everything is well combined.
Warm the flour tortillas in the microwave for about 20-30 seconds until pliable.
Spoon a generous amount of the chicken and spinach mixture onto each tortilla. Roll them up tightly and place them seam-side down in your greased baking dish.
Pour the enchilada sauce over the rolled tortillas, covering them well. Sprinkle the remaining salsa on top.
Sprinkle the shredded Mexican cheese blend evenly over the top of the enchiladas.
Place the dish in the preheated oven and bake for 25-30 minutes, until the cheese is melted and bubbly.
Let the enchiladas cool for a few minutes before serving. Top with your favorite toppings.