Avocado Cupcakes

From Kevin Smith, POPSUGAR Food

For the cupcakes:
1 1/2 cup flour
2 tablespoons cocoa powder
1 teaspoon baking powder
1 teaspoon baking soda
1/2 teaspoon salt
1 teaspoon espresso powder
1 cup water
1/2 medium avocado
1 cup sugar
2 tablespoons brown sugar
1 tablespoon white vinegar
1 teaspoon vanilla extract

For the frosting:
1/2 medium avocado
2 tablespoons butter, room temperature
1 1/2 teaspoon lemon Juice
2 cups powdered sugar

For the cupcakes: Preheat oven to 350°F, and prep a cupcake tin with liners.
In a large bowl, combine flour, cocoa powder, baking powder, baking soda, and salt.
In a small bowl, add espresso powder and water, and stir to dissolve.
In a medium bowl, mash your avocado. Stir in sugar and brown sugar. Then add vinegar, vanilla extract, and espresso, mixing until smooth.
Whisk liquid mixture into flour mixture until mostly smooth.
Scoop batter into your cupcake liners. Bake for 20 minutes, or until toothpick test comes out clean.
For the frosting: Using a stand or hand mixer, whisk avocado and butter until smooth. Then mix in lemon juice. Finally, mix in powdered sugar.
To assemble: Pipe frosting onto completely cooled cupcakes and garnish with avocado slices and fleur de sel.