01 - Preheat the oven according to the instructions on your frozen fries’ package. Line two baking sheets with foil and coat with nonstick cooking spray.
02 - In a small bowl, mix together the brown sugar, garlic powder, onion powder, chili powder, paprika, salt, and black pepper.
03 - Spread the frozen fries in a single layer on the prepared baking sheets. Sprinkle evenly with the seasoning blend, reserving about ½ teaspoon for topping later.
04 - Toss the fries to coat evenly. Bake according to the package instructions, rotating trays halfway through if needed, until fries are golden and crispy.
05 - In a medium skillet over medium-low heat, melt the butter.
06 - Whisk in the flour and cook for 1–2 minutes, whisking constantly, to form a roux.
07 - Slowly pour in the milk, whisking until smooth and fully combined.
08 - Simmer until slightly thickened, then gradually stir in the shredded cheddar cheese until fully melted and smooth. If the sauce becomes too thick, add a splash more milk. Reduce heat to low to keep warm.
09 - Layer a quarter of the fries onto a serving plate. Spoon over ¼ of the cheese sauce. Drizzle with 1 tablespoon ranch dressing and sprinkle a pinch of the reserved seasoning on top, if desired.
10 - Repeat with the remaining fries, cheese sauce, and ranch for the other servings.
11 - Serve immediately with extra ranch, cheese sauce, or ketchup on the side for dipping.