Heat vegetable oil in a large skillet or wok over medium-high heat.
Add diced onion and sauté until translucent.
Stir in minced garlic and cook for about 30 seconds.
Add shrimp and cook until they turn pink, about 2-3 minutes.
Toss in peas and carrots, cooking for another 2 minutes.
Push the mixture to one side of the pan and add the cooked rice on the other side.
Pour soy sauce and sesame oil over the rice, mixing well.
Combine all ingredients, breaking up any clumps of rice.
Season with salt and pepper to taste.
Garnish with sliced green onions before serving.