Step 1

Preheat the oven to 350 F.

Step 2

Chop the tomato and bell pepper into ½-inch cubes. Finely slice the spinach.

Step 3

Into a measuring cup, pour the egg whites, chopped tomatoes, chopped bell pepper, and sliced spinach, then mix together. Sprinkle in the salt and black pepper and mix together again.

Step 4

Grab a muffin tray and spray it with nonstick spray, then spoon in the egg white mixture. Place the muffin tray in the oven and cook for 20 minutes.

Step 5

After 20 minutes, remove the tin from the oven and serve the egg cups immediately.