Big City Tavern's Drunk By Chocolate Cocktail

• 1.5 ounce breckenridge bourbon
• .5 ounce chocolate syrup
• 6 mint leaves
• 2 ounce chocolate stout beer
• 1 ounce vanilla syrup

1. Add whiskey, chocolate syrup, and mint leaves to mixing glass. Shake with ice and strain into an old fashioned glass. Top with stout and garnish with a mint sprig.