Grease and line a 9×13 metal baking pan and preheat the oven to 350°F.
In the bowl of a stand mixer, whip together the butter, granulated sugar, and vanilla until fluffy (about 4-5 minutes).
Scrape down the sides, add eggs one at a time on low speed.
Mix in the flour, baking powder, baking soda, and salt.
Pour in the buttermilk slowly while mixing on low.
Add a couple of drops of pink food coloring and mix until evenly incorporated.
Remove the bowl and pour the batter into the prepared pan.
Bake for 30-35 minutes or until fully baked. Let it cool completely.