Directions
Preheat your oven to 350°F / 175°C. Generously grease a 12-cup standard muffin tin with cooking spray or butter.
Melt the butter in a medium skillet over medium heat.
Add the diced tomato and yellow onion, cooking for 3-4 minutes until softened.
Divide the cooked vegetable mixture evenly among the 12 prepared muffin cups.
In a large bowl, whisk together the eggs, coconut milk, sliced green onions, salt, and pepper until fully combined and slightly frothy.
Carefully pour the egg mixture over the vegetables in the muffin cups, filling each about three-quarters of the way.
Sprinkle the shredded mozzarella cheese evenly over the top of each muffin.
Bake for 20-25 minutes, or until the eggs are set and the tops are lightly golden. Allow the muffins to cool in the pan for a few minutes before removing.
Don't overfill the muffin cups! Fill them only about three-quarters full to prevent them from spilling over as they puff up during baking.