Preheat oven to 400°F / 200°C. Move the rack to the top third position. Pat chicken breasts dry with paper towels.
Arrange chicken side by side in a 9x13-inch ceramic or glass baking dish. Season both sides with garlic powder, Italian seasoning, salt, and pepper.
In a medium bowl, whisk heavy cream, chicken broth, white wine, tomato paste, cornstarch, oregano, minced garlic, and red pepper flakes until smooth and cornstarch is fully dissolved. Stir in sun-dried tomatoes.
Pour the sauce around the chicken breasts. Do not pour over the tops.
Bake uncovered for 30 to 35 minutes until the internal temperature reads 165°F (74°C) at the thickest point.
Remove from oven. Spoon sauce over each breast. Scatter freshly grated Parmesan over the top. Wait 90 seconds for it to melt from residual heat.
Scatter torn basil leaves. Rest 5 minutes. Plate over pasta or mashed potatoes with a generous spoonful of sauce.