Add the butter and sugar to a bowl and beat together for about a minute. Make sure to scrape down the sides of the bowl so all the butter is evenly blended.
1 cup butter, 1 ½ cups granulated sugar
Add the egg and vanilla and beat again.
1 egg, 1 ½ teaspoons vanilla extract
Add the flour, baking powder and salt and mix to form a smooth dough.
2 ½ cups all purpose flour, 1 teaspoon baking powder, ½ teaspoon salt
If you are adding any mix-ins to the dough, add it at this point. You can divide the dough and make different flavored cookies at this step as well.
Roll the dough into a log about 2 inches in diameter. Wrap the log tightly in plastic wrap then place in the fridge to chill for at least 4 hours or longer. I like to let the dough sit overnight in the fridge so it is nice and firm.
Preheat your oven to 350 degrees F and line a baking tray with parchment paper.
Unwrap the cookie dough log and slice it into ¼ inch slices. Place the slices on the parchment lined tray about 2 inches apart.
Bake the cookies for 10 minutes. The edges will be a light golden brown.
Move the baked cookies to a cooling rack then enjoy!