Heat your wok or large skillet over medium-high heat until shimmering, then add a tablespoon of cooking oil and swirl to coat the surface.
Add the sliced cremini mushrooms in an even layer. Let them cook undisturbed for about 2 minutes, until their edges turn golden brown and they release a rich, earthy aroma.
Stir the mushrooms, then cook for another 2-3 minutes, stirring occasionally until they are deeply browned and slightly crispy around the edges. Remove them from the pan and set aside.
In the same pan, add a little more oil if needed, then toss in the minced garlic and grated ginger. Cook for about 30 seconds until fragrant—your kitchen will fill with a warm, spicy aroma.
Add the cold, day-old rice to the pan, breaking up any clumps with your spatula. Spread the rice in a thin layer and fry for about 2 minutes, allowing it to become slightly crispy and hot.
Return the browned mushrooms to the pan, then pour in soy sauce and sesame oil. Toss everything together quickly, ensuring the rice is evenly coated and fragrant, cooking for another 2 minutes until everything is well combined and hot.
Check the dish—rice should be shiny and slightly crispy, mushrooms deeply browned, and the aroma rich with umami. Turn off the heat, then sprinkle sliced green onions over the top for a fresh, crisp finish.
Serve immediately while hot, allowing the earthy aroma and crispy bits to delight your senses. Enjoy this savory, sophisticated take on classic fried rice.