Garden Frittata Recipe - Delicious Vegetarian Italian Dish

Ingredients

• 1 medium onion , chopped
• 1 clove garlic , minced
• 2 medium tomatoes , chopped
• 1 tbsp vegetable oil
• 0.5 tsp italian seasoning
• 0.25 tsp black pepper
• 0.5 tsp salt
• 6 eggs , lightly beaten
• 1-10 oz (283 g) package frozen spinach , thawed and squeezed dry
• 0.5 cup sharp cheddar cheese , grated