Preheat the oven to 400°F. Line a baking sheet with aluminum foil and spray the foil lightly with nonstick spray.
In a medium bowl, whisk together the 1/2 cup raw honey and 2 teaspoons warm water until combined. Remove and reserve 1/4 of this honey mixture in a small bowl; leave the remaining honey mixture in the medium bowl.
In a separate bowl, combine 1/2 cup whole-wheat panko breadcrumbs, 1 teaspoon Italian seasoning, 1/4 teaspoon cayenne pepper, 1/4 teaspoon paprika, 1/2 teaspoon garlic powder, 1/4 teaspoon red pepper flakes, 1/4 teaspoon kosher salt, and 1/4 teaspoon chili powder; stir to mix evenly.
Add the 1-inch chicken breast cubes to the bowl with the larger portion of the honey mixture and toss until each piece is coated on all sides.
Working in batches if needed, press each honey-coated chicken piece into the panko-spice mixture so it is evenly coated; shake off any excess and arrange the pieces in a single layer on the prepared baking sheet with space between them.
Bake for 10 to 12 minutes, then turn each piece and return to the oven. Continue baking until the chicken is golden, crispy, and cooked through, about 10 more minutes.
Remove the baking sheet from the oven, drizzle the reserved honey-water over the chicken, and sprinkle with the diced green onions. Serve immediately.