Cut baked sweet potatoes in half and carefully scoop out the center of each half, leaving about ½ inch border of sweet potato left.
Sprinkle each half with salt and pepper (use about ½ teaspoon of each total). Divide spinach, tomato, and feta if using evenly between each sweet potato half.
Mix together eggs with remaining ½ teaspoon each of salt and pepper and water or milk. Carefully pour into whisked eggs into sweet potato halves.
Bake for 15-20 minutes or until eggs are set.
Notes
Feel free to crack each egg directly into each half of the potato--if you would prefer your eggs to not be scrambled.