Mince the onions.

Slice the zucchini or mince the cooked broccoli.

Cook the cauliflower.

Sauté the onions in olive oil until tender.

Add the zucchini or broccoli and cauliflower to the skillet.

In a bowl, beat the eggs and Parmesan cheese until blended.

Add the pepperoni to the egg mixture.

Pour the egg mixture over the vegetables in the skillet.

Cook over low heat, without stirring, for about 15 minutes.

When only the surface is moist, put the skillet under the broiler for 1 minute or less until the surface is set.

Cut into pie wedges and serve.