Prep the slow cooker: Lightly grease the insert with olive oil or spray. This helps prevent sticking and makes cleanup easier.
Layer the potatoes: Add halved baby potatoes to the bottom.
Sprinkle with a pinch of salt and pepper so they’re seasoned from the start.
Season the chicken: Pat chicken dry. In a small bowl, mix salt, pepper, Italian seasoning, and paprika. Rub it all over the chicken on both sides.
Whisk the sauce: In a measuring cup, combine melted butter, chicken broth, minced garlic, and heavy cream.
Stir in the grated Parmesan until it starts to melt into the mixture. Add lemon juice if using.
Assemble: Place chicken on top of the potatoes. Pour the garlic-Parmesan mixture evenly over everything.
Cook low and slow: Cover and cook on Low for 4–5 hours or on High for 2.5–3.5 hours.
Chicken should be tender and reach 165°F internally. Potatoes should be easily pierced with a fork.
Finish the sauce: If the sauce looks thin, remove the chicken to a plate and tent with foil. Stir the potatoes gently.
Cook uncovered on High for 15–20 minutes to thicken slightly, or stir in 1–2 tablespoons of grated Parmesan to help it tighten up.
Taste and adjust: Add a pinch more salt, pepper, or lemon juice to brighten the flavor. Stir in chopped parsley.
Serve: Plate the potatoes and chicken, spoon over the creamy garlic sauce, and finish with extra Parmesan and parsley.