Preheat the Oven: Preheat oven to 425°F. Grease a 13 x 18-inch baking sheet with nonstick spray or line with parchment paper.
Prepare the Rice Mixture: In a large bowl, mix together the soy sauce, oyster sauce, sesame oil, and minced garlic. Add the cold cooked rice, peas and carrots, white onion, and green onions. Season with salt and pepper to taste, then stir to coat the rice evenly.
Bake the Rice: Spread the seasoned rice mixture evenly onto the prepared baking sheet. Bake for 15 minutes.
Add the Eggs & Butter: Remove the pan from the oven and scatter the scrambled eggs over the rice. Place thinly sliced butter pats on top.
Finish Baking: Return the pan to the oven for an additional 1–2 minutes, just until the butter melts and the eggs warm through.
Serve & Enjoy: Stir the rice to incorporate the butter and eggs. Serve immediately and enjoy!
