Savory Ham & Cheese Scones

Bahan-bahan (8 porsi)

• 2 cups (250g) all-purpose flour (spooned & leveled), plus more for hands and work surface
• 1 Tablespoon (12g) granulated sugar
• 2 and 1/2 teaspoons baking powder
• 3/4 teaspoon garlic powder
• 1/2 teaspoon salt
• 1/4 teaspoon freshly ground black pepper
• 3 Tablespoons chopped fresh chives
• 1 cup (about 100g or 3.5 oz) shredded cheddar cheese
• 1/2 cup (8 Tbsp; 113g) unsalted butter, frozen (see note)
• 2/3 cup (160ml) cold buttermilk, plus 1 Tablespoon for brushing
• 1 large egg, separated
• 3/4 cup (about 110g or 3 oz) finely chopped ham
• optional for topping: flaky sea salt