Cook the orzo per the package instructions
In a large skillet over medium high heat add the butter and olive oil
Once the butter is melted add in the diced onion, carrots and celery. Allow the veggies to sauté for 4-5 minutes until they start to soften up.
Reduce the heat to low and sprinkle the all-purpose flour over the veggies and whisk together until it forms a paste/roux. While stirring constantly, allow the roux to cook for 2-3 minutes.
Pour in the chicken broth, heavy whipping cream, and chicken boullion powder. Whisk together until no clumps are present, and the mixture starts to thicken.
Add in the diced chicken and allow the mixture to simmer until it reaches desired thickness
Pour in drained orzo and stir to combine
