Preheat oven to 350˚F. Spray a 8 or 9-inch quiche dish with cooking spray or lightly grease with vegetable oil.
Pour egg mixture into the prepared quiche dish. Top with spinach proscuitto mixture (much of the spinach mixture will sink into the eggs).
*I love the Stockmeyer prosciutto from Trader Joe's.
It's very lean, mildly smoked and has great flavor!
Costco also has a wonderful smoked prosciutto, as I'm sure many other stores do too.
**Gruyere cheese can be quite pricey but you don't need much for this recipe and it really adds a ton of fabulous flavor.
Trader Joe's has a domestic Gruyere which is very reasonably priced along with being very tasty.