1. Prepare the Chicken and Potatoes: Start by patting your chicken breasts or thighs dry with paper towels. This helps them absorb the seasonings better. Quarter your small potatoes into roughly equal-sized pieces. If using larger potatoes, cut them into 1-inch chunks.

2. Whisk the Flavorful Coating: In a medium bowl, whisk together the olive oil, minced garlic, grated Parmesan cheese, Italian seasoning, salt, and black pepper until well combined. This mixture is where all the incredible flavor comes from.

3. Combine Ingredients in Slow Cooker: Place the quartered potatoes in the bottom of your slow cooker. Arrange the chicken pieces over the potatoes. Pour the prepared garlic parmesan mixture evenly over the chicken and potatoes, making sure everything is well coated.

4. Add Liquid and Cook: Pour the chicken broth or water into the slow cooker. This provides moisture and helps create a delicious sauce. Cover with the lid and cook on high for 3-4 hours, or on low for 6-8 hours, until the chicken is tender and cooked through, and the potatoes are soft.

5. Check for Doneness: The chicken should shred easily with a fork, and the potatoes should be tender when pierced with a fork. If not, continue cooking for a bit longer.

6. Serve and Garnish: Once cooked, gently stir the contents of the slow cooker to distribute the sauce. Serve hot, garnished with a sprinkle of fresh chopped parsley and extra grated Parmesan cheese, if desired.