In the bowl of a stand mixer fitted with the paddle attachment, beat butter and sugars at medium speed until light and fluffy, 3 to 4 minutes, stopping to scrape sides of bowl. Add egg and vanilla, beating until well combined.

In a medium bowl, whisk together flour, salt, baking powder, and baking soda. With mixer on low speed, gradually add flour mixture to butter mixture, beating just until combined. Stir in chocolate. Cover and let stand at room temperature until ready to use.