margarita cupcakes for the holidays

Ingredients

• 1 stick sweet butter, unsalted
• 1 box white cake mix [no pudding in the mix]
• 1 tablespoon baking powder
• 1 cup cake flour
• 1/8 teaspoon salt
• 1/4 cup sugar, white
• 1 can (10 oz) can frozen margarita mix, thawed [undiluted]
• 3 large egg whites
• 1 teaspoon pure vanilla extract
• 3 tablespoons vegetable oil
• 1 tablespoon grated lime zest
• 1/4 cup water
• 3 tablespoons tequila
• TEQUILA MIXTURE
• 1/4 cup powder sugar
• 2 tablespoons key lime juice
• 2 tablespoons tequila
• ICING
• 1 stick sweet butter, unsalted, softened
• 8 ounces 1 package cream cheese, softened
• 1 tablespoon lemon juice
• 2 tablespoons key lime juice
• 1 teaspoon key lime zest or 1 tsp lemon zest
• 4-5 cups confectioners' sugar
• 3 tablespoons tequila
• 1 teaspoon electric green gel food color
• DECORATION
• 1/4 cup coarse white sugar or shite decorator sugar crystals
• 24 slices thin lime slices [about 3 whole limes]
• 24 - cocktail umbrellas