"Instantly delicious...."
butter
large onion, chopped
cloves garlic, minced
fresh thyme leaves
large russet potatoes, peeled and diced
low-sodium chicken broth
plus 2 tbsp. milk, divided
cornstarch
heavy cream
Kosher salt
Freshly ground black pepper
Shredded cheddar, for serving
Chopped cooked bacon, for serving
Freshly chopped chives, for serving