Preheat oven to 400 degrees.

Thoroughly grease a muffin pan. Set aside

In a large bowl whisk together eggs and milk. Whisk in flour and salt until combined completely. Fold in cheese, spinach and scallions.

Pour batter into prepared muffin pan. Fill each muffin cup completely.

Bake on a baking sheet (to catch any drips) for 50 minutes, rotating the pan once in the oven, until popovers are puffed up and golden brown. Take care not to open the oven except for the one time to turn the pan.

Allow to cool in the pan for one minute, then loosen with a knife and remove from pan.