Heat the butter or olive oil in a large skillet over medium heat. Once hot, add the shallot and mushrooms, and cook, stirring often, until golden brown, about 4-5 minutes.
Add the garlic and stir frequently for 30 seconds. Remove from heat, season with sea salt and freshly cracked black pepper to taste, then set aside.
Meanwhile, cook the orzo pasta in a large saucepan of well-salted boiling water, according to the package instructions.
Drain, reserving ¼ cup of the cooking liquid, and return the drained orzo to the large saucepan.
Add the peas, mushroom mixture, Parmesan, parsley, sea salt, and freshly cracked pepper to taste, along with a bit of the reserved pasta water, as needed; mix thoroughly. Enjoy.