2 fluid ounces vanilla-flavored vodka
2 fluid ounces chocolate liqueur
1 fluid ounce Irish cream liqueur
1 maraschino cherry with juice
1 teaspoon chocolate sauce, or to taste
Fill a cocktail shaker halfway with ice. Pour vodka, chocolate liqueur, Irish cream, and a splash of maraschino cherry juice over ice; cover the shaker and shake until chilled.
Drizzle the bottom of a martini glass with chocolate sauce and drop maraschino cherry into the bottom of the glass. Strain shaker contents into prepared glass.