Cheesy Scalloped Potatoes Recipe

INGREDIENTS

3 lb

Yukon Gold potatoes, peeled (optional) and sliced ⅛-inch thick

2 cups

shredded sharp cheddar cheese, divided

1/2 cup

grated Parmesan cheese

3 tbsp

butter

medium onion, thinly sliced

4 cloves

garlic, minced

3 tbsp

all-purpose flour

3 cups

whole milk

1 tsp

kosher salt

1/2 tsp

black pepper

1/4 tsp

grated nutmeg

1 1/2 tbsp

fresh thyme, divided