Make omelet: Heat the oil in a non-stick pan over medium-high heat. Saute the mushrooms until golden brown and softened. Lower the heat to medium. Add the onion and pepper and saute until softened. Add in the butter, eggs, and tomato. Reduce the heat to low. Use a spatula to pull the cooked eggs into the center, letting the liquid egg fill the space behind it. Continue going around the pan, pulling the eggs toward the center until they are nearly set. Sprinkle cheese over the eggs and fold the omelet in half; cook until the cheese is melted.
Prepare and brew the coffee to your liking.
Arrange the fruit in a small bowl.
Make toast: Toast the bread then spread it with butter.
Serve: Enjoy the omelet with fruit, toast, and coffee.