Roasted Vegetable Frittata

Ingredients (makes 6 to 8 servings): 1 small zucchini (baby marrow), 25mm diced 1 red bell pepper, seeded and 25mm diced 1 yellow bell pepper, seeded and 25mm diced 1 red onion, 25mm diced 1/3 cup good olive oil Salt and freshly ground black pepper 2 teaspoons minced garlic (2 cloves) 12 extra-large eggs 1 cup…