Season the chicken with garlic powder, onion powder, salt, and pepper.
Heat olive oil and butter in a pan, sear chicken until golden brown (just a few minutes per side).
In a small bowl, whisk chicken broth and cornstarch until smooth.
Pour into slow cooker and stir in garlic, heavy cream, Italian seasoning, salt, pepper, red pepper flakes, and paprika.
Add sun-dried tomatoes, parmesan, and chopped basil to the mixture.
Nestle the seared chicken into the sauce.
Cover and cook on LOW for 3 hours or HIGH for 1½ hours until chicken is fully cooked and tender.
Serve hot with your favorite sides like Broccoli Cauliflower Salad or sip on chilled Russian Apple Kvas.