Heat olive oil in a large skillet over medium-high heat.
Add sliced chicken breast, season with salt and pepper, and cook until golden brown and crispy on the edges—about 5–7 minutes.
Toss in the garlic and stir for 30 seconds until fragrant.
Push the chicken to one side of the pan and pour the eggs into the other side. Scramble them until just cooked, then mix with the chicken.
Add the cold rice, sesame oil, and soy sauce. Stir everything together and break up any clumps of rice.
Add peas and carrots and cook for another 2–3 minutes until warmed through.
Top with sliced green onions and serve hot.