More-Vegetable Less-Egg Frittata

Frittata is one of those rare any-time-of-day dishes. You can eat it when you make it, or at room temperature, or even cold, straight from the refrigerator. The revelation here is that one egg easily binds two cups of cooked vegetables, and they’re all good: chopped spinach or chard, chopped fresh or dried tomatoes, potato or sweet potato slices, aspara…