Boil salted water and cook the rotini pasta according to package instructions until al dente.
Heat olive oil in a skillet over medium heat.
Season chicken breasts with salt and pepper, then cook in the skillet for 6-7 minutes on each side.
Remove the chicken from the skillet and let it rest before slicing.
In the same skillet, add pesto and heavy cream, stirring until smooth.
Drain the pasta and add it to the skillet, tossing to coat.
Slice the chicken and place it on top of the pasta.
Garnish with pine nuts and serve hot.