Preheat the oven to 180°C.
Place a skillet on high heat and add 1 Tbsp olive oil. Add the onion and when softened add the eggplant and green pepper and cook for 5 minutes. Add some water if the vegetables start to dry up. Add the smoked paprika, soy sauce and balsamic vinegar and cook for 2 more minutes until all liquids have evaporated. Let the mixture cool.
In a food processor, blend the walnuts well. Then add the eggplant mixture and blend together for a few seconds. Transfer the mixture in a bowl, add the cooked bulgur and mix well.
Place the banko breadcrumbs in a plate. Form small balls of the eggplant and bulgur mixture, coat with the breadcrumbs and place on an oven tray lined with baking paper. Drizzle with a bit of olive oil and bake for 25-30 minutes until golden brown.