Steam 4 cups broccoli florets over boiling water for 3–5 minutes, until bright green and just tender.
Drain the broccoli well and pat dry with paper towels. Crumble or chop the florets into smaller pieces. Toss the broccoli with 1 teaspoon olive oil and salt and fresh ground pepper to taste.
Generously spray a standard-size nonstick muffin tin with olive oil spray. Evenly divide the prepared broccoli among the muffin cups.
In a medium bowl, beat 4 whole large eggs with 1 cup egg whites. Stir in 1/4 cup Pecorino Romano (or Parmesan), and add salt and fresh ground pepper to taste. Mix until combined.
Pour the egg-and-cheese mixture into the muffin cups over the broccoli, filling each cup to a little more than 3/4 full.
Evenly sprinkle 1/4 cup reduced-fat shredded cheddar over the tops of the filled cups.
Bake at 350°F until the egg muffins are set and slightly golden on top, about 20 minutes.
Let the muffins cool in the pan for about 5 minutes, then loosen with a knife and transfer to a rack or plate. Serve immediately, or wrap leftovers in plastic wrap and store in the refrigerator.
Notes
9. Let the muffins cool in the pan for about 5 minutes, then loosen with a knife and transfer to a rack or plate. Serve immediately, or wrap leftovers in plastic wrap and store in the refrigerator.