Preheat oven at 180C. Grease a 6" pie dish or a baking tin.
In a pan, heat olive oil. Add the sliced onions and garlic, lightly saute for 3-4 minutes on medium flame, until onions are soft.
Add the chard or spinach and saute for 2-3 minutes until just wilted.
In a bowl, whisk the eggs, milk, salt, pepper, herbs well and add the crumbled cheese.
Transfer the chard mix from the pan into the bowl and mix with a fork.
Pour into the greased pie dish. Top with bread crumbs, more freshly ground black pepper and dried herbs and bake for 20-25 minutes until a knife comes out clean.