Crockpot Scalloped Potatoes: Easiest Comfort Food Ever!

Ingredients

• 3 lbs Yukon Gold potatoes, peeled and thinly sliced
• 1 medium yellow onion, thinly sliced
• 1/2 cup unsalted butter, melted
• 1/4 cup all-purpose flour
• 3 cups whole milk
• 1 tsp sea salt
• 1/2 tsp black pepper, freshly ground
• 1/4 tsp garlic powder
• 1/4 tsp nutmeg, freshly grated (optional)
• 1 cup shredded sharp cheddar cheese (optional)
• 2 tbsp fresh chives, chopped