Preheat your oven to 350°F (175°C). This ensures that your cake bakes evenly.
In a mixing bowl, sift together the powdered sugar and flour. Repeat this process at least twice to ensure the mixture is aerated and free of lumps.
In a clean mixing bowl, add the room temperature egg whites. Using an electric mixer, beat them on medium speed until they begin to froth. Gradually increase the speed to high and continue beating until soft peaks form.
Once you have soft peaks, add the lime zest and fresh lime juice to the egg whites. Beat for an additional minute until well combined.
Gently fold the sifted powdered sugar and flour mixture into the egg whites. Use a rubber spatula and be careful not to deflate the egg whites. The goal is to maintain the airy texture.
Pour the batter into an ungreased angel food cake pan, smoothing the top with a spatula. Bake in the preheated oven for 35-40 minutes, or until the cake is golden brown and springs back when lightly touched.
Remove the cake from the oven and immediately invert the pan onto a cooling rack. Let the cake cool completely in the pan to prevent it from collapsing.
Once cooled, gently run a knife around the edges of the pan to loosen the cake. Invert it onto a serving plate, and gently tap to release.
Slice the Lime Angel Food Cake and serve it with a dollop of whipped cream and additional lime zest for a beautiful presentation. Enjoy the refreshing flavors with family and friends!