Cut chicken into 1/2 - 1" chunks.
Melt Duck Fat and Brown Chicken.
Once Chicken is browned, add Pesto sauce. Stir to combine chicken and sauce, until the parmesan is melted.
Add Cream, Half & Half, and Salt. Stir until warmed through.
As the Cream and Half & Half are warming through, add your pasta to the water and cook for 3-4 minutes, until it is floating. Be sure to stir when adding to the pot, to prevent it from sticking together.