This recipe comes courtesy of my martini-lovin' big sis, Marnee. Although she doesn't have quite as many martini-drinking days now that she has a wee one, I've still never had a chocolate martini as good as the ones that Marn could whip up. This is a bit of a twist on the original, and it sure was yummy. I didn't have any half-and-half on hand, so I substituted 1 shot of milk and 2 shots of whipping cream. Either works; just use what you have on hand.
Ingredients
3 shots half-and-half
1/2 shot of banana liquor
2 shot of chocolate liquor
1/2 to 1 shot of vanilla vodka
1/2 shot of Kahlua
1/2 shot of Godiva liquor
Directions
Add all ingredients to a shaker filled with ice. Shake well until fully combined and frothy. Decant into a chilled martini glass. Enjoy!
3 shots half-and-half 
