Preheat the oven and bake the French fries according to the package instructions until crispy and golden.
While the fries bake, heat the cooking oil in a large skillet over medium heat.
Add the sliced chicken breasts and cook for about 4 minutes, turning occasionally, until fully cooked.
Stir in the butter, hot sauce, garlic powder, and onion powder. Cook for another 2–3 minutes until the butter melts and the sauce coats every piece of chicken.
Remove the fries from the oven and spread half of the shredded Monterey Jack cheese evenly over them.
Spoon the buffalo chicken and all of the sauce over the fries.
Sprinkle the remaining cheese over the top.
Return the pan to the oven and bake for 5–8 minutes, or until the cheese is completely melted and lightly browned.
Remove from the oven and let the Buffalo Chicken Fries rest for about two minutes before serving.
Drizzle with ranch dressing or serve it on the side. Garnish with sliced green onions and enjoy immediately while everything is hot and crispy.