Rinse the chicken breasts under cold water and pat them dry. Season with salt, black pepper, garlic powder, onion powder, and Italian seasoning.
In a large skillet, heat olive oil over medium-high heat. Sear the chicken for 3-4 minutes on each side until golden brown. Remove from skillet.
Transfer the chicken to a slow cooker. In the same skillet, add sun-dried tomatoes and cook for 1-2 minutes.
Pour heavy cream over the chicken in the slow cooker. Add cooked sun-dried tomatoes and grated Parmesan cheese. Stir gently to combine.
Cover the slow cooker and cook on low for 4-6 hours or on high for 2-3 hours. Sprinkle fresh basil before serving.