Creamy Scalloped Potatoes

INGREDIENTS

2 tbsp

butter

2 tbsp

all-purpose flour

1/2 tsp

salt

1/4 tsp

freshly ground black pepper

1 cup

whipping cream, half-and-half, or light cream

1/4 cup

grated Parmesan cheese

2 lb

russet potatoes, peeled and cut into 1/8-inch-thick slices

Snipped fresh chives (optional)