1. Make the filling
Sauté the shallots, mushrooms, roasted red peppers and garlic. Stir in the arugula and parsley.
2. Whisk the eggs
Combine the eggs, milk, salt & pepper.
3. Assemble the quiche
Spread two-thirds of the filling into a pie dish with half the feta.
Pour in the egg mixture and top with the remaining filling and feta.
4. Bake the quiche.