Heat 1 tablespoon of sesame oil in a large skillet or wok over medium-high heat.
Add the diced chicken breast and cook until golden brown and fully cooked, about 5-7 minutes. Season with salt and pepper to taste, then remove the chicken from the skillet and set aside.
In the same skillet, add another tablespoon of sesame oil, then add the minced garlic and grated ginger, sautéing for about 30 seconds until fragrant.
Add the mixed vegetables and cook for 3-5 minutes until they’re tender.
Push the vegetables to one side of the skillet, and pour the beaten eggs into the other side. Scramble the eggs until cooked through, then mix everything together in the skillet.
Add the day-old jasmine rice, cooked chicken, and diced pineapple. Pour the soy sauce over the mixture and stir well to combine, ensuring that all ingredients are evenly coated.
Stir-fry for an additional 3-5 minutes until the rice is heated through and slightly crispy.
Toss in sliced green onions, adjusting seasoning with additional salt and pepper if necessary.