Pre-heat oven to 350°.
Prepare your pie crust
In a large saute pan, heat olive oil over medium. Add garlic, onion and scallion, cook until translucent. Add spinach and saute, mixing often until spinach is wilted. Remove from pan and put in a bowl.
In a separate large bowl, add the eggs, milk, salt, and pepper. Whisk well.
Add crumbed feta to bowl with spinach. Add spinach mixture to large bowl with eggs. Mix well.
Pour egg and spinach mixture into pie dish so that it fills dish but doesn't overflow.
Bake for 50 minutes until egg has set.
Cool slightly, slice and serve