Crispy Smashed Potatoes

Bahan-bahan (4 porsi)

• 1 ½ pounds baby gold potatoes
• 1 tablespoon plus ½ teaspoon kosher salt (divided)
• 2 ½ tablespoons extra-virgin olive oil
• ¼ teaspoon course ground black pepper (plus more for serving)
• Flaky sea salt (such as Maldon or fleur de sel, for serving)