Preheat the oven to 350°F
In a saucepan, melt butter over medium heat. Stir in flour until well blended
Gradually whisk in milk, stirring constantly until the mixture thickens
Add Desert Pepper Trading Company Chile con Queso, salt, and pepper. Stir until the cheese is melted and the sauce is smooth.
Layer sliced potatoes in a greased baking dish. Pour the cheese sauce over the potatoes. Add a small handful of shredded cheese between layers.
In a separate bowl, mix crushed tortilla chips with a little melted butter
Sprinkle the chips mixture over the potatoes
Bake for 45-50 minutes or until potatoes are tender and the top is golden brown