01 -
Preheat the oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
02 -
In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
03 -
In another bowl, beat together the softened butter, buttermilk, eggs, orange zest, vanilla extract, and orange juice until well combined.
04 -
Gradually add the wet ingredients to the dry ingredients, mixing until just combined.
05 -
Divide the batter evenly between the prepared cake pans and smooth the tops.
06 -
Bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
07 -
Allow the cakes to cool in the pans for 10 minutes, then transfer to a wire rack to cool completely.
08 -
Beat the softened butter until creamy. Gradually add the powdered sugar, then mix in the orange juice and zest until smooth and fluffy.
09 -
Once the cakes are completely cooled, spread frosting between the layers and over the top and sides of the cake.