1-Step One: Prepare and Bake the Fries: Start by preheating your oven to 425°F. This high temperature is essential for achieving that perfect crispy exterior on your fries. Open the bag of frozen regular-cut French fries and spread them in an even layer on a large baking sheet. Avoid overlapping the fries, as this prevents proper air circulation and leads to soggy spots. Bake the fries for 50 minutes until they turn golden brown and reach maximum crispiness.

2-Step Two: Prepare the Buffalo Chicken: While the fries bake, combine the shredded rotisserie chicken and buffalo sauce in a large bowl. Toss everything together until the chicken is evenly coated with that signature tangy, spicy sauce. Set this mixture aside so the flavors can meld together. The buffalo sauce not only flavors the chicken but also helps keep it moist during the final broiling step.

3-Step Three: Create the Cheese Sauce: The homemade cheese sauce is what truly sets this buffalo chicken fries recipe apart from others. In a saucepan over medium heat, melt the unsalted butter completely. Once melted, whisk in the all-purpose flour and cook for 1-2 minutes until the mixture turns slightly browned. This creates a roux that will thicken your sauce. Reduce the heat to low and gradually whisk in the room-temperature whole milk. Adding the milk slowly while whisking constantly prevents lumps from forming. Continue cooking and whisking for 3-5 minutes until the sauce thickens enough to coat the back of a spoon. Remove the pan from the heat and stir in the buffalo sauce, kosher salt, sharp cheddar cheese, and mozzarella cheese. Keep stirring until all the cheese has melted and the sauce is smooth and creamy.

4-Step Four: Season and Assemble: Once the fries finish baking, remove them from the oven. Sprinkle the seasoned salt and pepper over the hot fries, then toss them to coat evenly. Spread the fries back into an even layer across the baking sheet. Even distribution ensures every bite gets properly seasoned. Top the seasoned fries with the buffalo chicken mixture, distributing it evenly across the surface. Place the baking sheet under the broiler for 1-3 minutes. Watch carefully during this step because broilers can quickly go from perfectly crispy to burnt. You want the fries to crisp up and the chicken to heat through completely.

5-Step Five: Add Finishing Touches and Serve: Remove the baking sheet from the oven and immediately drizzle the warm cheese sauce over the loaded fries. The heat from the fries and chicken helps keep the cheese sauce melty and smooth. Garnish generously with chopped green onions, a drizzle of ranch dressing or blue cheese, additional buffalo sauce if desired, and bleu cheese crumbles for that authentic buffalo wing experience. Serve right away while everything is hot and the fries maintain their satisfying crunch. For a complete meal, consider serving with celery sticks on the side for a refreshing contrast to the rich, spicy flavors.