1 white cake mix
oil and egg whites (as called for in cake mix instructions)
3/4 c strawberry margarita drink mix (syrup, non-alcoholic)
1/2 c water
1 c (2 sticks) butter (salted or unsalted)
1/4 tsp salt (if using unsalted butter)
4 c powdered sugar
1/2 tsp vanilla extract
1 tsp lime juice
2-3 TBSP milk
1 TBSP lime zest
sliced strawberries, rinsed and dried
Preheat oven to 350°. Line cupcake pans with paper liners.
Add 1/2 c water to 3/4 c margarita mix (to create 1 1/4 c of liquid).
In large bowl, combine cake mix, strawberry liquid mixture, oil, and egg whites. Beat for 2 minutes on medium speed.
Bake for 16-20 minutes. Set aside and allow to cool.
Using the whisk attachment of an electric mixer, beat butter on medium speed until completely smooth (about 1 minute).
Add salt (if using unsalted butter).
One cup at a time, add 2 cups of powdered sugar, beating after each addition.
Add vanilla and lime juice and beat to combine.
Add 1 TBSP milk and continue beating.
Add 2 remaining cups of powdered sugar, one cup at a time.
Add remaining 1 TBSP milk until consistency is reached (1 more TBSP if you prefer thinner frosting). Add a bit of lime zest, if you'd like.
Pipe the frosting onto the cupcakes after they have cooled completely.
For the topping
Top with a strawberry slice and a sprinkling of lime zest.
(If you chill these, make sure to take them out of the fridge a few minutes before serving...to allow the frosting to soften back up. It hardens in the fridge!)