Preheat your oven to 330 degrees.
In a bowl combine buttermilk, vanilla extract, and room temp eggs. Mix to break up the eggs and combine.
Add flour, salt, baking powder, and sugar to the bowl of your mixer.
Add the softened butter and mix with your paddle attachment on the lowest setting on your stand mixer until it looks like coarse sand, about 1 minute.
With your mixer on low, add around half of your wet ingredients. You really just want to add enough liquid so that everything is a little wet without forming a dough texture, it should resemble cake batter. Then turn it to medium and let it mix for 2 minutes. Set a timer and do not go over. This helps develop the structure of the cake, without over mixing.
Scrape your bowl after the 2 minutes. With your mixer on low add the rest of your wet ingredients. Mix just until totally combined. About 15 seconds.
Prepare your pan by spraying the sides and lining the bottom with parchment paper.
Pour all of the batter into the pan and smooth the batter so it’s flat in the pan, then cover with aluminum foil.
Bake until done about 55 min. When the cake is done the sides will start to slightly pull away from the pan and a toothpick inserted in the center will come out clean.
Place on cooling rack, carefully remove foil.
Let the cake cool for about 15 min or until the pan is cool enough to touch and remove it from the pan to cool completely.