Preheat oven to 350°. Spray eight silicone baking cups with nonstick spray.
Crack eggs into a large measuring cup with a spout. Have the kids take turns whisking the eggs into a froth.
Carefully pour the eggs halfway up each baking cup.
Put the spinach, tomatoes, seasoning and cheese into small bowls, and let the kids separate the ingredients as equally as possible among the egg cups.
Season with salt and pepper.
Bake for 15-20 minutes, or until set. For extra pizzazz, serve the egg cups in decorative cupcake liners.