Mix flour, baking powder, and salt together in a bowl and keep it aside.
2 ⅔ cups All purpose flour, 1 teaspoon Baking powder, ½ teaspoon Salt
In a bowl, mix butter and sugar until smooth and creamy.
1 cup Butter, 1 cup Sugar
Add egg and vanilla extract and mix until well combined, scraping the sides of the bowl as needed.
1 Egg, 1 teaspoon Vanilla extract
Add the flour mixture to the wet ingredients and mix until combined. This will be thick and sticky.
Divide this dough into two equal portions. Shape one portion into a rectangle, cover it in plastic wrap, and refrigerate for 30 minutes.