Preheat oven as directed on cake mix. Prepare your cupcake pan with liners.

Combine cake mix, margarita mix, egg whites, oil and lime zest, stirring until well mixed. Beat with an electric mixer on medium speed for two minutes.

Spoon batter into your lined cupcake pan, filling each liner approximately 2/3 of the way full.

Bake according to package directions, typically about 18-25 minutes or until a toothpick inserted into the center comes out clean.

Combine powdered sugar, water and tequila and stir well to create your glaze. You may need slightly more water to thin out the glaze so that you can brush it on to your cupcakes. Once your cupcakes have been removed from the oven and cooled for approx 5-10 minutes, brush a layer of glaze over the top of each. Allow them to cool completely.

Combine butter and cream cheese in a bowl and mix with mixer until light and fluffy.

Add in your lime juice and green food coloring until desired shade is reached (remember it will lighten slightly when you add your powdered sugar).

Add in your powdered sugar, one cup at a time, until the desired consistency has been reached (could be slightly less or more than five cups).

Frost each cupcake as desired. You can pipe on a ring of frosting and sprinkle with sugar and salt mixture, then finish frosting your cupcake, or frost your entire cupcake and sprinkle the sugar and salt mixture on top.

Due to the cream cheese in the frosting, it's best to store these in the refrigerator.

Enjoy!