- 1 (15.25 ounce) package yellow cake mix (such as Betty Crocker®)
- 1/2 cup butter, melted
- 3 eggs
- 1/2 cup lime margarita mix (such as Jose Cuervo®)
- 1 egg yolk
- 3/4 cup lemon-lime soda
- 1 1/2 (1.5 fluid ounce) jiggers tequila (such as Jose Cuervo®)
- Preheat oven to 325 degrees F (165 degrees C). Line muffin cups with paper liners.
- Mix cake mix and butter together in a large bowl; add eggs, margarita mix, and egg yolks and stir just until combined. Pour lemon-lime soda into batter and stir until foam is dissolved. Stir tequila into the batter. Pour batter into the prepared muffin cups.
- Bake in the preheated oven until a toothpick inserted in the center comes out clean, about 30 minutes.