01 -
Preheat oven to 175°C (350°F). In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
02 -
Pour milk into a measuring cup, add the freshly squeezed lime juice, stir to incorporate, and set aside.
03 -
In the bowl of a stand mixer fitted with a paddle attachment, cream butter and sugar on medium-high speed until light and fluffy, about 2 minutes.
04 -
With the mixer on low, add eggs one at a time, beating well after each addition. Gradually add the dry ingredients in three batches, alternating with the milk mixture, starting and ending with the dry ingredients. Mix until just incorporated, ensuring speed remains low.
05 -
Divide batter evenly in a muffin pan. Bake for 18–24 minutes, or until a toothpick inserted into the center comes out clean.
06 -
Remove cupcakes from the oven and brush with tequila. After about 5 minutes, transfer them to a wire rack and let cool completely before frosting.
07 -
In the bowl of a stand mixer with a paddle attachment, beat butter until light and fluffy, about 3 minutes. Turn off mixer, add confectioners' sugar, then turn back on low. Slowly add lime juice one tablespoon at a time and mix until thick and creamy.
08 -
Add frosting to a pastry bag fitted with an open star tip. Pipe frosting onto cooled cupcakes and top with sanding sugar. Optionally, sprinkle with a few granules of kosher salt.