Heat olive oil in a large skillet over medium heat.
Add the diced onion and sauté for 3–4 minutes until translucent.
Stir in the garlic and bell pepper; cook for another 2–3 minutes.
Incorporate the chopped zucchini, stirring frequently for about 5 minutes.
Add cherry tomatoes and cook for an additional 4–5 minutes.
Stir in the drained white beans, dried oregano, salt, and pepper.
Cook, stirring occasionally, for an additional 3–4 minutes until everything is heated through.
Remove from heat, garnish with fresh parsley, and serve.