1Slice the bananas into thin rounds and set aside.
In a small bowl, mix the brewed black coffee with 1 tablespoon of honey until the honey dissolves.
In another bowl, whisk together the whole milk, nonfat Greek yogurt, and the remaining 2 tablespoons of honey until smooth and creamy.
Melt the unsalted butter in a large skillet over medium heat.
Toast the brioche slices in the skillet for 1 to 2 minutes per side, until golden and lightly crisp. Work in batches if needed.
Cut the toasted brioche into bite-sized cubes.
Lightly drizzle the coffee-honey mixture over the brioche cubes, allowing them to absorb the flavor without becoming too soggy.
In serving glasses or a trifle dish, layer some coffee-soaked brioche cubes, followed by banana slices, then a spoonful of the creamy yogurt mixture.
Repeat the layers until all ingredients are used, finishing with a creamy yogurt layer on top.
Dust the top evenly with unsweetened cocoa powder.
Chill for 15 to 20 minutes before serving for a softer trifle texture, or serve immediately for a toastier bite.