Heat the olive oil in a large skillet over medium heat. Add the sausage and cook until browned, breaking it up with a spoon as it cooks.
Add the onion, garlic, and red bell pepper to the skillet. Cook for 4 to 5 minutes until the vegetables start to soften.
Stir in the chickpeas, diced tomatoes, olives, oregano, salt, and black pepper. Bring the mixture to a simmer and cook for 10 minutes, stirring occasionally, until the sauce thickens slightly.
Remove the skillet from the heat. Sprinkle the feta cheese and parsley over the top just before serving.