Special equipment: Eight to ten 12-inch skewers
Thread 6 brioche cubes onto each skewer, leaving 1/4 inch of space between cubes; leave out overnight to dry.
Prepare a grill for medium-high heat. Whisk together the buttermilk, eggs, butter, sugar, cinnamon and 1/2 teaspoon salt in a baking dish; soak the skewers in the mixture for 5 minutes, turning as needed.
Spray a large piece of foil with cooking spray and place it on one side of the grill grate. Lay the skewers on the foil, leaving about an inch of space between them. Grill, covered, turning occasionally, until golden, 5 to 8 minutes.
Meanwhile, brush the bananas with oil and place cut-sides down on the other side of the grill grate (not on the foil). Cook, turning as needed, until golden and covered in grill marks, 3 to 5 minutes. Serve the skewers and bananas drizzled with honey.
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