Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Slice the eggplant in half lengthwise and score the flesh in a crosshatch pattern, being careful not to cut through the skin.
Brush the eggplant flesh with half of the olive oil and season with a pinch of the sea salt and black pepper.
Place eggplant halves cut-side down on the baking sheet and roast for 25-30 minutes until the flesh is very tender.
While the eggplant roasts, heat the remaining olive oil in a skillet over medium heat and sauté the diced onion and minced garlic until translucent.
Add the ground turkey to the skillet, breaking it apart with a spatula, and cook until browned and no longer pink.
Stir in the tomato puree, dried oregano, and the remaining sea salt and black pepper; simmer for 5-7 minutes to allow the flavors to meld.
Flip the roasted eggplant halves over and gently press down the centers to create a well.
Spoon the savory turkey mixture into the eggplant wells and sprinkle with the crumbled feta cheese.
Return the stuffed eggplant to the oven for 5 minutes until the cheese is softened, then garnish with fresh parsley before serving.