Soften butter at room temperature, add fine sugar and powdered sugar and stir evenly with an egg beater until fluffy, add eggs in 2-3 times, add vanilla extract for the next time when the eggs are completely integrated into the butter body, stir evenly, sieve low-gluten flour into the butter body, mix evenly with a rubber scraper, put the batter into a paper bag, squeeze it on a baking tray, and preheat the oven at 375 F/190.

Butter is a kind of solid oil processed from milk, which is the product of mixing fresh milk and filtering some water from the thick objects on the upper layer. Mainly used as seasoning, it is nutritious but high in fat, so don't overdo it.