Heat the olive oil in a pan and sauté the onion and garlic. Add the peas and ¼ cup water. Cook until the peas are tender and the water evaporates. Set aside to cool.
Beat the eggs in a bowl and add the cheese, milk, mint and seasoning. Add the pea and onion mixture. Make sure the ingredients are well combined.
Spray all around a non stick pan with oil. Add the egg mix and cook on a low to medium heat for approx 5 - 7 minutes until the frittata is cooked on the bottom but still soft and runny on the top. Place it under a grill to cook the top until it is firm and lightly golden.
Note: The free range egg should never be overlooked in the healthy kitchen. Mid week it can be used to make a healthy meal in minutes. It's a terrific source of protein and is packed full of nutrients.