Inspired by J. Kenji López-Alt's San Francisco-Style Vietnamese American Garlic Noodles. This version is a one pot orzo twist with the addition of shiitake mushrooms and green onions. Extra savory, flavorful, and bursting with umami! Optionally serve with a crispy parmesan chicken cutlet or the protein of your choice for an even more complete meal.
Heat oil in a large pan over medium-high heat. Add the chopped mushrooms and sliced green onions. Cook, stirring occasionally, for about 10 minutes, until the mushrooms are browned and some golden color develops. Remove from the pan and set aside in a bowl.
In the same pan, add more oil if needed. Lower the heat to medium and add the minced garlic. Sauté for 1 minute until fragrant then optionally add the red pepper flakes and cook about 30 more seconds, stirring constantly. Add the uncooked orzo and toast toast the orzo for about 1-2 minutes until lightly golden.
Pour in water and bring to a simmer. Cook, stirring occasionally, until the orzo is nearly tender. Add more water as needed to prevent the orzo from drying out. You should have a small amount of liquid remaining before moving on to the next step. About 10 minutes.
Once the orzo is nearly cooked through, turn the heat to low. Stir in the soy sauce, fish sauce, and oyster sauce. Then, add the grated Parmesan and butter, stirring until thoroughly combined. Finally, mix in the reserved green onion and mushroom mixture.
Divide among bowls to serve. Top with more Parmesan and the reserved dark green scallion tops. Optionally, top with a a crispy chicken cutlet or protein of your choice.