Begin by cutting the corn tortillas into quarters. Heat a generous amount of neutral-flavored vegetable oil in a large skillet over medium heat. Once the oil is hot, add the tortilla pieces in batches and fry until they are golden brown and crispy. Use a slotted spoon to remove them from the oil and place them on a paper towel to drain excess oil.
In the same skillet, add the diced white onion and sauté over medium heat until it becomes translucent and fragrant, about 5 minutes.
Once the onion is cooked, add the shredded chicken breast to the skillet. Pour in the red sauce and stir to combine. Let this mixture simmer for 5-7 minutes, allowing the flavors to meld together. If the sauce is too thick, add a splash of water to achieve your desired consistency.
Add the crispy tortilla pieces to the skillet and gently stir to coat them in the sauce. Let them cook for an additional 2-3 minutes, allowing the tortillas to absorb some of the sauce but still retain their crunch.
Drizzle the heavy cream over the chilaquiles and sprinkle the crumbled cheese on top. Season with salt and ground black pepper to taste. Cook for another minute to warm through.
Remove the skillet from heat and garnish the chilaquiles with finely chopped coriander. Serve immediately while still hot, and enjoy this delightful dish!