Heat butter in a non-stick pan or wok. Saute garlic, onion, carrots, and peas until translucent and soft. Add the rice, soy sauce and oyster sauce. Add salt and pepper. Increase the heat to high. Stir the rice until combined with the other ingredients.
Make a hollow in the same pan and crack the egg. Scramble the egg in the pan, once fully scrambled, mix over with the fried rice. Stir and fry for 5 minutes. Stir in the sesame oil and scallions.