Start by gathering and prepping all your ingredients. Dice the onion, mince the garlic and ginger, and thinly slice the green onions.
In a large skillet or wok, melt 1 tablespoon of unsalted butter over medium heat. In a bowl, whisk the 3 large eggs until well combined. Pour the eggs into the skillet, cooking until just set, then remove them from the skillet and set aside.
In the same skillet, add 2 tablespoons of olive oil and heat over medium-high. Add the diced yellow onion and sauté for about 2-3 minutes, until translucent. Then, add the minced garlic and ginger, cooking for an additional minute until fragrant.
Next, stir in the frozen peas and carrots and frozen corn. Cook for about 3-4 minutes, or until the vegetables are heated through and tender.
Add the 2 cups of cooked rice, breaking up any clumps with your spatula. Stir everything together, ensuring the rice gets coated with the oil and mixed with the vegetables.
Pour in the oyster sauce, chicken bouillon powder, soy sauce, white or black pepper, rice vinegar, and sesame oil. Mix well to ensure every grain of rice is seasoned.
Add the scrambled eggs back into the skillet along with the thinly sliced green onions. Stir everything together until well combined and heated through, about 2-3 minutes.
Once everything is heated through and well mixed, remove from heat. Serve your fried rice warm, garnished with extra green onions if desired.