Heat the oil in a large skillet over medium heat. Add the onions, carrots, bell pepper, and mushrooms, and cook until the vegetables are tender, about 5 minutes.
Add the cooked rice to the skillet and stir to combine. Add the salt, black pepper, and soy sauce, and cook for an additional 2 minutes.
In a separate bowl, lightly beat the eggs. Pour the eggs over the rice and vegetables in the skillet, and cook until the eggs are set, about 3 minutes.
Transfer the omelet to a plate and serve warm.
Interesting Facts
My-Omurice is a popular Japanese dish that was first created in the early 1900s.
Omurice is a portmanteau of “omelet” and “rice”, and is also known as “omuraisu”.
This dish is often served with ketchup or furikake (a Japanese seasoning made of seaweed, sesame, and dried fish).