Giant Almond Cookie (ไจแอนต์อัลมอนด์คุกกี้)

Ingredients

• Unsalted butter 230 g
• Brown sugar 130 g
• Granulated sugar 120 g
• Egg 1
• Vanilla extract ½ tsp
• All-purpose flour 400 g
• Baking powder 1 tbsp
• Baking soda ½ tsp
• Salt ½ tsp
• Ground almonds 65 g
• Granulated sugar 50 g
• All-purpose flour 10 g
• Salt ⅛ tsp
• Unsalted butter 50 g
• Egg yolk 1
• Egg white for brushing
• Sliced almonds for topping