Preheat your oven to 350 degrees f.
If using a silicone muffin tray there's no need for oil. If using a muffin tin, then lightly spray the cups with avocado oil.
Dice the peppers, onions, and chop the cilantro.
In a large bowl gently crack in the eggs.
Add in your milk of choice, then whisk to combine.
Stir in the peppers, onions, cilantro, and seasonings.
Whisk until well combined.
Evenly scoop your egg mixture into each of your 12 muffin cups, filling them about three-quarters full.
Bake for 18-20 minutes, until the eggs are cooked through and nicely puffed.
Carefully remove from the oven and immediately sprinkle the tops with shredded cheese.
Let the cheese melt while the muffins are slightly cooling.
Divide onto serving plates and garnish with extra cilantro.
Enjoy!