• First of all, you have to treat your oven. So, preheat the oven to 350 degrees. Moreover, lubricate the cake pans with butter or oil and also flour them.
• Take a large-sized bowl and beat butter with sugar in it using an electric beater. You can also you a hand blender but the electric beater makes the combining easy for you.
• In the next step add the lime zest in and beat until you attain a creamy mixture.
• One by one break and add the eggs to this beaten mixture. Also, beat in the fresh lime juice.
• Take another medium-sized bowl and combine the baking soda with the cake flour. Now add the buttermilk, and the flour mixture in the beaten egg and butter mixture gradually while making folds.
• Then pour this mixture smoothly into the greased cake pans. Bake your cake mixture for 20-25 minutes.
• You can check if the cake is baked by inserting a toothpick in the center of the cake. After baking let it settle and cook for 10 minutes.

How to prepare white chocolate frosting

• Combine chocolate with cream in a bowl. Microwave this mixture in the oven to melt all the chocolate. Then, let it cool.
• Then in a large bowl combine the chocolate mixture with vanilla and butter. Beat the mixture and then add the confectioners' sugar to this mixture. Beat well.
• Spread this white chocolate frosting in the layers, at the top and drizzling from the sides of the cake.
• Garnish with key lime wedges, if you like.