Add the cubed eggplant, drained chickpeas, diced onion, and minced garlic to the slow cooker.
Pour in the crushed tomatoes and vegetable broth.
Drizzle the olive oil over the top and sprinkle in the oregano, cumin, salt, and pepper.
Stir everything together until the ingredients are evenly combined.
Cover the slow cooker and cook on low until the eggplant turns very soft and the stew thickens.
Ladle into bowls and finish each serving with chopped parsley and crumbled feta.