Heat the olive oil in a large skillet over medium heat.
Season the chicken breasts with salt and pepper.
Add the chicken breasts to the skillet and brown on both sides.
Sprinkle the ranch dressing mix over the chicken.
Pour in the chicken broth and heavy cream, stirring gently.
Add garlic and onion powder, stirring to combine.
Reduce the heat to low, cover, and simmer for 20-25 minutes.
Check for doneness, then remove the chicken and let rest for a few minutes.
Spoon the creamy ranch sauce over the chicken before serving.