Preheat the oven to 200°C/392° F fan.
Use a sharp knife to vertically score each eggplant in three places.
Line a baking pan with parchment paper, arrange the eggplants in the pan, drizzle with olive oil and sprinkle with some salt and thyme.
Bake for 30-35 minutes. When ready, remove from the oven and set the eggplants aside to cool on a wire rack or a plate.
Place a deep skillet or pan over medium to high heat and allow to get very hot. Add the olive oil, onions, garlic, sugar, and a little salt. Sauté for about 15 minutes, stirring almost constantly, until the onions and garlic are nicely caramelized.
Add the tomatoes, cinnamon, nutmeg, pine nuts, and bouillon cubes. Cook for about 10 minutes until the liquid has evaporated.
Remove the pan from heat, add the parsley and mix.
Use a spoon to fill the eggplants with the mixture. Sprinkle with crumbled feta and place under the oven grill for 5-10 minutes until the cheese has melted and turned slightly golden.
Sprinkle with oregano and serve.