- Combine all ingredients (reserving the caramel syrup and espresso powder to rim the glass) in an ice-filled cocktail shaker. Shake vigorously for 20-30 seconds.
- Strain the banana mudslide into an ice-filled, espresso-rimmed rocks glass, or make it a martini cocktail by straining into a chilled martini glass.
- To make the caramel espresso rim, pour a few teaspoons of caramel syrup onto a small, flat plate. Sprinkle a separate small plate with grains of espresso powder. Dip the outer rim of the glass into the caramel syrup, then lightly coat the rim with the espresso powder.