Preheat your oven to 350 degrees f. and lightly grease a 12 muffin pan with avocado oil.
Using a food processor or grater, grate your sweet potato.
In a large bowl, whisk together the eggs, milk, chives, mustard powder, oregano, and a good pinch of sea salt.
Heat a large skillet over medium heat.
Add in 1 tablespoon of oil and once hot, add in your grated sweet potato.
Cook stirring occasionally for about 5 minutes. Stir in the zucchini, and bell pepper and continue to cook for 3-4 minutes, until veggies soften a bit.
Add cooked veggies into the bowl with the whisked eggs, together with yoir shredded cheese.
Stir well to combine.
Evenly pour the egg and vegetable mixture into the muffin pan, filling just about 3/4 of each cup.
Carefully transfer your pan to the preheated oven and bake for 20-25 minutes or just until egg mixture is set and lightly golden brown.
Keep an eye on them as we don't want to overcook the eggs.
Set the hot muffin pan on a wire rack to cool for 5 minutes.
Serve warm and enjoy!
These stay great for up to 3 days in the refrigerator.