Preheat oven to 350 and spray the cake pans with pam baking spray
In a large bowl, whisk the flour, baking powder, and salt together. Set aside.
Using a standing mixer, beat the butter and sugar together creamy.
Beat in the eggs and vanilla extract until combined.
With the mixer on low speed, add the dry ingredients just until combined.
With the mixer still running on low, add the buttermilk, lemon zest, and lemon juice and mix just until combined.
Pour batter evenly into cake pans.
Bake for around 21-26 minutes or until the cakes are baked through.