Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a small saucepan, whisk together honey, soy sauce, sriracha, chili flakes, Chinese five spice, garlic powder, olive oil, and rice vinegar; set aside.
Cut the chicken breasts into long thin strips.
Place the chicken strips in a bowl and pour about 1 cup of buttermilk over them to lightly coat; set aside.
Set up three shallow plates: one with flour (seasoned with salt and pepper), one with remaining buttermilk, and one with breadcrumbs (seasoned with salt and pepper).
Dredge each chicken strip first in flour, then in buttermilk, and finally in breadcrumbs, pressing to adhere; transfer to the prepared baking sheet in a single layer.
Bake for 30–45 minutes, until the coating is golden and the chicken is cooked through (cut one piece to check if needed).
While the chicken bakes, bring the prepared glaze to a boil over medium-high heat, then reduce to medium and simmer until reduced by about half and thickened.
When the chicken is cooked, drizzle or brush the glaze generously over the fingers and garnish with chopped green onions.
Optional: to fry instead, heat vegetable oil in a large skillet and fry chicken strips 3–5 minutes per side until golden and cooked through.