Grease and line a 13×18 standard jelly roll pan. Preheat the oven to 350°F.
In a stand mixer, beat together butter, granulated sugar, and vanilla until light and fluffy (about 4-5 minutes).
Scrape down the sides, add eggs one at a time, mixing on low until just incorporated.
Add flour, baking powder, baking soda, and salt. Pour in buttermilk while mixing on low until combined.
Pour the batter into the prepared jelly roll pan and bake for 18-22 minutes. Allow the cake to cool completely.