Beat your eggs together with the mustard powder in a bowl with a small pinch of sea salt. Set aside.
Heat your oil in a small non-stick skillet over medium heat.
Sauté the green onion, garlic, zucchini, and peas, for 3-5 minutes, or until just tender crisp.
Stir in the spinach or kale and cook for a minute longer, just until wilted.
Season lightly with sea salt and pepper, then set veggies aside on a plate.
In the same preheated skillet, add your beaten eggs and allow to cook undisturbed, over medium heat, for 2-3 minutes.
Once the omelet is golden on the bottom, flip and cook for a minute more.
Stuff your omelet with the cooked veggies and slide onto a serving plate.
Serve alongside halved cherry tomatoes and any fresh herbs, sprouts, or microgreens you might have on hand.