Irish cocktail whiskey chocolate ganache cupcakes in jars for St. Patrick's Day

Blogger ever clever mom made Irish cocktail cupcakes in jars for St. Patrick's Day! She's got the recipe and writes:

Serving the cupcakes up in jars means the frosting can be creamier and I added a lot more of that whiskey chocolate ganache this way. I love the way they turned out in the glass with the frosting on top... almost like little pints of Guinness.