In a medium nonstick skillet, heat 1 teaspoon of oil over medium heat. Add the mushrooms, and cook until just golden, about 2 minutes. Add the red peppers, and cook until softened, about 2 minutes. Add the shallots, and cook until golden, about 2 minutes. Add the tomatoes. Season with salt and pepper. Transfer vegetables to a bowl. Wipe out the skillet with a paper towel.
Makes 1 omelet.