Heat the oil in a large skillet over medium-high heat. Add the onions, carrots, bell pepper, and garlic and cook for 5 minutes, stirring occasionally.
Add the frozen peas and carrots and cook for an additional 5 minutes, stirring occasionally.
Stir in the cooked rice, soy sauce, and sesame oil and cook for 5 minutes, stirring frequently.
Push the rice mixture to the side of the skillet and add the eggs. Cook the eggs until they are cooked through and scramble them with the rice.
Stir in the scallions and cook for 2 minutes, stirring frequently.
Serve warm.