Ingredients:

2 tablespoons butter
2 tablespoons all-purpose flour
1 cup milk
1 cup shredded cheddar cheese
Salt and pepper, to taste
Optional: a pinch of paprika or cayenne pepper for a spicy touch

Instructions:

In a saucepan over medium heat, melt the butter.
Once the butter is melted, stir in the flour until smooth to create a roux.
Slowly pour in the milk while whisking continuously to avoid lumps.
Cook the mixture until it begins to thicken, stirring constantly.
Once the mixture has thickened, reduce the heat to low and stir in the shredded cheddar cheese until melted and smooth.
Season the cheese sauce with salt, pepper and optional paprika or cayenne pepper, depending on your preference.
Remove the pan from the heat and let the cheese sauce cool slightly before serving.
Pour the hot cheese sauce over the hot fries and enjoy