This creamy blended coffee cocktail takes its cues from banana coffee, a popular mix of morning joe and frozen banana. Bold cold-brew coffee concentrate takes well to the earthy, softly smoky flavors of mezcal, cinnamon, and vanilla, and the frozen banana adds luxurious texture and a touch of sweetness to the drink. Serve at brunch with French Toast Casserole or a basket of muffins, or spin up a round as a vacation afternoon pick-me-up. Be sure to start with ripe bananas—whenever they start going spotty, just peel and stash in your freezer.