Prep the griddle. Heat the griddle on medium heat until it reaches about 400℉. Add about 1 tablespoon of your favorite high-heat cooking oil to the heated surface and spread it around with your spatula. *See notes for skillet cooking.
Fry the rice. Add the cooled rice to the oiled griddle surface in a thin even layer. Allow the rice to begin to heat up, untouched for about 3-4 minutes. Then use your spatula to break up any large clumps and stir together. Continue to stir fry the rice, stirring occasionally, until heated through.
Cook the Spam and diced onions. While the rice cooks, add the diced Spam to a clear area on the griddle, spreading it out in an even layer so it can char. Then add the diced onions and whites of the green onions to a separate area on the griddle, and let them start to sweat a bit. *TIP – Place the onions on the griddle near the diced Spam, so the fat from the meat can start to render and flavor the onions.
Add the peas and carrots. Once the Spam and onions are about halfway cooked through, sauté them together. Then add the peas and carrots to the mix. Sauté the vegetables and meat together every so often, but allow them plenty of time to cook untouched on the hot griddle as well. This helps to create a nice char and add texture and flavor to the dish.
Add garlic and butter to the rice. When the rice has developed some color on the bottom, sauté together. Then make a "well" in the rice on the griddle. Add the butter and minced garlic to the well. Allow the garlic to cook in the butter until it becomes fragrant. Right before the garlic starts to turn color, mix the melted butter and garlic into the fried rice, sautéing the rice to evenly distribute the garlic.
Mix the fried rice, Spam, and veggies together. Mix the fried rice with the cooked Spam and veggies. Toss everything together so that the ingredients are evenly combined.
Add the sauces. Pour the soy sauce and oyster sauce over the fried rice. Mix together well. Sauté the for about 2-3 minutes.
Add the scrambled eggs. Pour beaten eggs partially on the side of the rice and partially on the griddle surface. Cook the eggs, then mix scrambled eggs in with the fried rice.
Garnish and serve. Drizzle with sesame oil and sauté the Spam fried rice again for about 1 minute. Then sprinkle on the top parts of sliced green onions. Season with salt and pepper to taste, if needed. Remove the rice from the griddle, and serve immediately with Yum Yum sauce, Sriracha, or your favorite fried rice condiments.