Get out and measure your ingredients.
Preheat the oven to 350ºF.
In a large bowl, cream the butter and sugar.
Beat in the vegetable oil, eggs, and vanilla.
Whisk until blended.
In a separate bowl, combine the flour, cocoa powder, baking soda, baking powder.
Stir together with a whisk.
Add to the bowl with the butter and mix.
Slowly incorporate milk into the batter.
Once well combined, fold in ½ cup of the Andes mints.
Stir with a whisk until blended.
Line a muffin tin. Spoon about 2 tablespoon of batter into the paper-lined muffin pans and place in the center rack of the oven. Bake for 18 minutes.
While the cupcakes are baking, make the frosting.