Kentang oven iris

Bahan-bahan (9 porsi)

• 3 lbs Yukon gold potatoes (6 to 8 medium potatoes, $2.68*)
• 6½ tsp salt (divided, $0.18)
• 5 Tbsp salted butter ($0.61**)
• 5 Tbsp all-purpose flour ($0.04***)
• 2 cups whole milk ($0.36****)
• 1 cup kaldu ayam (atau kaldu sayuran, $0,13)
• ¼ tsp black pepper (freshly ground, $0.01)
• ¼ tsp onion powder ($0.03)
• ¼ tsp garlic powder ($0.03)
• 1 pinch ground nutmeg ($0.01)
• 1 pinch cayenne pepper ($0.01)