Good-Cooking - Tomato Frittata

Ingredients

• 2 tablespoons olive oil
• 2 medium onions, thinly sliced
• 1 (15 ounce) can of Italian tomatoes, drained and coarsely chopped
• 6 eggs, beaten
• Salt and freshly-ground pepper, to taste
• 3 tablespoons freshly-grated Parmesan cheese
• 1/2 cup roughly chopped fresh basil