In a large pot or Dutch oven, heat a splash of the water over medium-high heat. Cook the mushrooms until soft, about five to eight minutes, adding more water as needed to prevent sticking.
Add the orzo, milk, chicken, peas, and the remaining water. Bring to a simmer and cook uncovered, stirring occasionally for about 10 minutes or until the orzo is al dente. Add a splash of milk if more liquid is needed.
Stir in the basil and Parmigiano Reggiano. Divide into bowls and squeeze lemon juice over top to taste. Enjoy!
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Notes
You can refrigerate this in an airtight container for up to three days! So it’s great for leftovers and lunch packing.