All you need for this Nutella Martini is Boundary St. Bourbon, Crème de Cacao (white or dark, your preference; I used white because it's what I had in my liquor cabinet), Nutella and half and half.
If you want to do a fancy rim like in the picture, you just need to melt some Nutella on a plate in the microwave. Prepare another plate with chocolate sprinkles poured on it. Roll the rim of your martini glass in the Nutella and coat well. Then roll it in the sprinkles. Turn upside down in the freezer for 5-10 minutes prior to making your cocktail. This will help set the rim and keep it from running down the glass.
Combine all ingredients into a shaker pint. Shake until ingredients are well combined and cold. Strain into a chilled martini glass. Enjoy!