Parmesan Smashed Potatoes

Ingredients

• 3 pounds red potatoes, unpeeled
• 1 tablespoon kosher salt plus 2 teaspoons
• 1 1/2 cups half-and-half
• 1/4 pound (1 stick) unsalted butter
• 1/2 cup sour cream
• 1/2 cup freshly grated Parmesan
• 1/2 teaspoon freshly ground black pepper