On your cutting board or on a piece of wax paper, butterfly your chicken breast (slicing down the middle of one side trying to keep them connected so when it's opened it looks like a butterfly).
If your can't keep them connected it's fine you can simply create two smaller rolls. If the chicken breast is too thin to butterfly just hammer it flat as it is.
Place your silicone mat or other piece of wax paper on top of the chicken and hammer with the mallet to make it a thinner piece of meat for rolling.
Spread a layer of basil pesto over the top of the chicken breast
Place your mozzarella stick on one end and roll it up
Secure the roll with a toothpick inserted lengthwise to make it easier to keep it together and flip to sear the sides.
Season each roll with salt and pepper.
Heat up a saucepan and add a splash of oil and then sear each side for approx. 3 minutes.
Place seared rolls in casserole dish and place in the oven at 400°f for approx. 20 minutes. Start checking the internal temperature of the chicken after about 15 minutes. Throw in some tomatoes oil and salt for fire-roasted tomatoes.
The chicken is cooked when it reaches an internal temperature of 165°. The temperature will continue to rise even after being removed from the oven. I removed mine at 160°.
Let the chicken sit for 5 minutes before slicing into ¾" rounds. I threw some