Place the chicken breasts on a large cutting board and cut into bite sized (1/2-1 inch) pieces, sprinkle with salt & pepper to taste.
Heat the olive oil and butter in a large skillet over medium heat.
Add the cubed chicken and cook for 4-5 minutes just until seared on all sides.
Add the onion and garlic and cook, stirring constantly for 3 minutes.
Add the orzo to the pan and stir constantly for 2 minutes.
Pour in the chicken broth and half and half. Bring to a simmer, then reduce the heat to low, cover the pan with a tight fitting lid and cook for 5-7 minutes until orzo is soft.
Remove the pan from the heat and stir in the lemon juice and parmesan.
Video
Notes
NOTE: You can make this ahead and store in the refrigerator in a sealed container for up to 3 days. Reheat in a large pan on the stove top over low heat until warmed through, stirring occasionally.