Prepare all of your ingredients.
Spray the inside of a large microwave-safe mug, custard cup or ramekin with cooking spray. Add eggs and milk to the mug and using a fork, mix until the yolks are combined.
Add in spinach, tomatoes, mushroom, broccoli, basil, and pepper to taste. Gently stir to combine. Fill the mug to 2/3 full and don’t fill to the brim because the eggs will fluff up and expand during the cooking process.
Add mug to the microwave and cook on high for 1 minute.
Stir the mixture and microwave for an additional minute or until the eggs are almost set.
Cooking times will vary due to variations in microwave heating times. Remove from microwave and sprinkle with optional toppings if desired.