Prepare your veggies as needed - if using fresh zucchini finely shred and set to one side. If using frozen vegetables for the spinach and peppers then defrost and drain excess water.
Beat the eggs in a large bowl then add all the other ingredients serving 1/4 cup parmesan cheese and mix well.
Once all the mixture is distributed evenly amongst the muffins tins, place in the oven. At 10-15 minutes sprinkle the remaining parmesan on each muffin. Cook for an additional 15-20 minutes.
Notes
You can easily freeze this once cooked. They're perfect for travel days! Just allow to thaw or reheat in the microwave.