Fontina-Stuffed Pork Chops with Mashed Potatoes Recipe

Ingredients

• 1 tablespoon apple cider vinegar
• 1 teaspoon minced garlic
• 2 3/4 teaspoons kosher salt, divided
• 8 tablespoons unsalted butter, divided
• 1 teaspoon fresh thyme leaves
• 1 1/2 teaspoons black pepper, divided
• 4 bone-in, center-cut pork chops, about 1 1⁄2 inches thick
• 2 pounds russet potatoes, peeled and cut into 2-inch pieces
• 1/4 cup whole milk
• 1/4 cup sour cream
• 1 thinly sliced large yellow onion
• 2 cups shredded fontina cheese, divided
• 1 cup chicken stock