Best-Ever Scalloped Potatoes

• 4 to 6 medium potatoes, peeled
• salt and freshly ground black pepper to taste
• 3 Tbsp margarine

Slicer: Cut potatoes to fit feed tube. Slice, using medium pressure. Arrange in layers in sprayed 2-quart casserole. Sprinkle each layer with salt and pepper.

Steel Blade: Process margarine with flour and soup mix until blended, about 5 seconds. Pour boiling water through feed tube while machine is running and process until smooth. Transfer sauce to 4-cup glass measure. Mi