For the cupcakes: Preheat the oven to 350 degrees F. Butter a 12-cup muffin tin or line with parchment paper.
Blend the eggs, oil, granulated sugar and vanilla in a mixer. Add the flour, baking powder, gelatin and salt. Add the rum and blend until smooth. Do not over beat. Fill the tins halfway full with batter and bake until a toothpick inserted comes out clean, 15 to 18 minutes.
For the frosting: Cream the confectioners' sugar, butter and meringue powder until creamy and fluffy in a mixer. Add the vanilla and lime juice, cream until well blended. Mix in the avocado until smooth. Do not over beat. Add salt to taste.
Frost each cupcake with the frosting.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.