Peel the potatoes and cut them into thick fries (3/4 inch by 3 inches).
Bring a pot of water to a simmer, adding 4 tablespoons of salt.
Steam the potatoes for about 10 minutes until a knife inserted comes out clean.
Transfer potatoes to a bowl, drizzle with olive oil, and toss to coat.
Place potatoes on a nonstick baking sheet in a single, even layer.
Bake at 450 degrees for 10 minutes, then rotate the pan and bake for an additional 6 to 10 minutes until golden.
Make the Creamy Cheese Sauce:
In a saucepan over medium heat, melt butter.
Slowly whisk in milk and flour, stirring until no lumps remain.
Add shredded cheese, stirring until melted and the sauce is creamy.
Season and Serve:
Sprinkle Cajun seasoning over baked fries and mix thoroughly.
Drizzle with ranch dressing and about 1/3 cup of the cheese sauce.
Reserve the remaining cheese sauce for dipping.
Notes
Peeling the potatoes is recommended for the best texture.Be cautious not to over-steam the potatoes; they should not become mushy.Use toppings sparingly initially to find the right flavor balance.Serve extra ranch and cheese sauce on the side for dipping.To reheat, arrange fries on a baking tray and heat in a 380-degree oven for about 15 minutes, watching closely to prevent burning.