Crisp Classic Butter Cookies (Only 6 Ingredients) - My Home Made Recipe

Ingredients

• 1 cup (226 g) unsalted butter, softened
• 3/4 cup (90 g) powdered sugar, sifted
• 1 large egg yolk, room temperature
• 1 1/2 tsp pure vanilla extract
• 2 cups (250 g) all-purpose flour
• 2 tbsp (16 g) cornstarch
• 1/4 tsp fine sea salt
• 2 tbsp coarse sanding sugar (optional, for rolling)