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- Preheat oven to 325 degrees F and grease a 9×13-inch baking dish.
- In a large bowl, beat cream cheese until smooth, then mix in oil and sugar.
- Add eggs one at a time, mixing in between additions, then add vanilla.
- In a small bowl, sift together flour, baking powder, and salt, then mix dry ingredients into the wet just until combined. Gently mix in buttermilk just until smooth.
- Transfer batter to the prepared baking dish and bake for 35-40 minutes or until an inserted toothpick comes out clean.
- Allow cake to fully cool while you make the frosting.
- In a large bowl, mix cream cheese and butter until smooth. Slowly add in powdered sugar, then salt until fully combined.
- Frost cooled cake and then refrigerate until ready to serve.