Pat the pork tenderloins dry with paper towels.
Season both sides with salt, pepper, garlic powder, and Italian seasoning.
Heat the olive oil in a large skillet over medium-high heat.
Sear the pork for 2 to 3 minutes per side until golden brown. Remove from the skillet and set aside.
Reduce the heat to medium and add the minced garlic. Cook for about 30 seconds until fragrant.
Pour in the chicken broth and scrape up any browned bits from the bottom of the pan.
Stir in the heavy cream, Parmesan cheese, sun-dried tomatoes, and red pepper flakes if using.
Return the pork to the skillet and spoon some of the sauce over the top.
Cover and simmer over low heat for 15 to 20 minutes, or until the pork reaches an internal temperature of 145°F (63°C).
Remove the pork and let it rest for 5 minutes before slicing.
If you'd like a thicker sauce, mix the cornstarch with cold water and stir it into the skillet. Simmer for 2 to 3 minutes until thickened.
Serve the sliced pork with plenty of the creamy Parmesan sauce and garnish with fresh basil.