Preheat the oven to 475 degrees. Line a baking sheet with a wire rack or if you do not have a wire rack line with parchment, tin foil or a Silpat. Spray with cooking spray or oil with olive oil.
In three separate shallow bowls place the whole wheat flour, panko bread crumbs and buttermilk. Working in batches, dredge chicken in flour, dip in buttermilk, then coat with the panko bread crumbs, pressing them into the chicken. Lay on prepared baking sheet. Spray chicken with cooking spray. Bake until the chicken and coating is brown and crisp, about 15 minutes (10 if you cut your chicken really small).
Meanwhile, whisk water, soy sauce, jam, ketchup, hoisin, corn-starch, and vinegar together in bowl. Heat sesame oil in a large skillet with sides over medium heat until shimmering. Add garlic, ginger, and chili paste. Cook until fragrant, about 1 minute. Whisk in soy sauce mixture, bring to simmer, and cook until thickened, about 2 minutes. Return the chicken to the sauce and heat until just warmed through.
Serve with rice, green onions, sesame seeds and steamed broccoli if desired.
Slightly adapted from Pinch Of Yum.