Heat a large skillet with oil over medium-high heat. When the oil shimmers add the onions and bell pepper. Cook until soft. Add the garlic, zucchini, thyme and oregano to the pan. Cook until tender. Add the cooked white beans, salt, and peppper. Heat through and add the spinach. Turn off the heat and allow the spinach to wilt. Taste for seasoning and divide between 4 bowls. Top with chicken and parmesan. Serve immediately.