Step 1

Heat oven to 350 degrees. In a large mixing bowl, cream together oil, eggs, buttermilk, sugar, lemon zest, orange zest, lime zest, and lemon juice. Mix for 2-3 minutes.

Step 2

Fold in flour, baking powder, baking soda, and salt.

Step 3

Line a 9 x 13 aluminum baking pan with parchment paper. Spray with non-stick cooking spray. Pour batter into a cake pan and spread evenly.

Step 4

Bake for 27-33 minutes or until the toothpick comes out clean. Don't overbake. Let cool. Read the notes section to find out how to flip the cake.

Step 5

In a bowl, cream together butter and cream cheese until light and fluffy, about 3-4 minutes. Scrape the sides of the bowl often.

Step 6

Add powdered sugar. Stir in orange, lemon, and lime zest or just garnish it on the top. For extra lemon flavor, add 2 teaspoons of lemon juice to the frosting.

Step 7

If you desire to flip the cake, read the instructions below. If not, frost the cake and top with citrus slices. Cut into squares and serve.