Smashed Rosemary Potatoes

Ingredients (5)

• + 8 baby red potatoes, scrubbed, or more to taste add to pantry
• + 2 tablespoons olive oil, divided, or more as needed add to pantry
• ✓ 1 ½ teaspoons sea salt, divided
• + freshly ground black pepper to taste add to pantry
• + 4 sprigs fresh rosemary, or more to taste add to pantry