One Pot Ratatouille Orzo

Name: One Pot Ratatouille Orzo
Ingredients: 4 tablespoons olive oil; 1 eggplant, cut into 1 inch/2,5 cm thick pieces; 1 red bell pepper, cored and finely chopped; 1 green bell pepper, cored and finely chopped`; 1 zucchini, cut into 1 inch/2,5 cm thick pieces; 5 garlic cloves, minced; 1 shallot, finely chopped; 1 teaspoon each: salt, black pepper, herbs de Provence; 3 cups chicken broth, divided; 3 tablespoons double concentrated tomato paste; 1 bay leaf; 1 1/4 cups dry orzo pasta; 1 can (14 oz) whole peeled tomatoes; 20 basil leaves