What's healthy and green and goes great with eggs and cheese? Broccoli. You don't believe? Try this frittata recipe by Ellie Krieger and even your pickiest eater will agree. Loaded with cancer-fighting vitamins, antioxidants, and protein, this is the perfect wake up call on Sunday brunch.Broccoli and Cheddar Frittata4 large eggs4 egg whites2 tablespoons water2 teaspoons olive oil1 small red onion, sliced2 cups chopped cooked broccoli1/4 teaspoon saltFreshly ground black pepper1/2 cup shredded extra-sharp Cheddar1. Whisk eggs and egg whites with water until frothy.2. In an oven-proof non-stick skillet, heat oil over medium flame. Cook onions until...