Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Dice the eggplant into uniform 1-inch cubes and place them in a large mixing bowl.
In a small glass jar or bowl, whisk together the tamari, honey, toasted sesame oil, minced garlic, grated ginger, and red pepper flakes until well combined.
Add the ground turkey to the bowl with the eggplant, breaking it into bite-sized chunks with a spatula.
Pour half of the prepared sweet and savory sauce over the turkey and eggplant, tossing gently to ensure every piece is lightly coated.
Spread the mixture in a single, even layer on the baking sheet to ensure the eggplant roasts rather than steams.
Bake for 20 to 22 minutes, tossing the ingredients halfway through, until the turkey is cooked through and the eggplant is tender and browned.
Remove from the oven, drizzle with the remaining sauce for a glossy finish, and garnish with thinly sliced green onions before serving.