– 1/2 pound bacon – 4 tablespoons unsalted butter – ½ yellow onion finely chopped – 2 cloves garlic finely minced – 2 pounds Yukon Gold potatoes – ½ teaspoon black pepper – 1 teaspoon salt – ⅓ cup all-purpose flour – 2 cups chicken broth – 2 cups whole milk – 8 ounces grated cheddar cheese – 1 cup heavy cream – ½ cup chives