Step 1: Season the chicken well - Pat the chicken thighs dry with paper towels, especially the skin. This little step helps the thighs brown better in the skillet instead of steaming. Sprinkle both sides with 1 teaspoon of Italian seasoning, salt, and black pepper. I like to be generous with the seasoning here because chicken thighs can handle it, and that first layer of flavor makes a difference once everything cooks together.
Step 2: Heat the butter in your skillet - Set a large skillet over medium high heat and add the unsalted butter. Let it melt completely and get hot, but keep an eye on it so it does not burn. You want the pan hot enough that the chicken gives you that satisfying sizzle the moment it touches the butter. That quick sear is not about cooking the chicken through. It is about building flavor before the slow cooker takes over.
Step 3: Sear the chicken in batches - Place the chicken thighs skin side down in the hot skillet, working in batches so you do not crowd the pan. Let each side cook for about 3 to 4 minutes, until the skin is browned and the chicken has some color. Resist the urge to move it around too much. Letting it sit gives you that deeper golden crust that makes the finished meal feel extra special. Transfer the seared chicken to a plate and repeat until all the thighs are browned.
Step 4: Season the potatoes and garlic - Add the cut red potatoes to the bottom of your crockpot. Pour in the olive oil, then add the minced garlic, remaining 1 teaspoon of Italian seasoning, salt, and black pepper. Stir everything together until the potatoes are coated in the oil and seasonings. Smooth them into an even layer so they cook at the same pace and make a sturdy little bed for the chicken.
Step 5: Layer the chicken over the potatoes - Place the seared chicken thighs on top of the potatoes with the skin facing up. Try not to tuck the chicken down into the potatoes too much. Keeping the skin on top gives it the best chance of holding onto some of that nice seared texture instead of becoming too soft. Any buttery juices left on the chicken will slowly drip down and season the potatoes underneath.
Step 6: Slow cook until tender - Cover the crockpot and cook on high for 3 to 4 hours or on low for 6 to 8 hours. The chicken is ready when it is very tender and reaches an internal temperature between 175 and 195 degrees Fahrenheit near the bone. Chicken thighs are forgiving, which is one reason I love them for slow cooker meals. They stay moist and tender even after several hours, and the meat should pull away from the bone easily with a fork.
Step 7: Finish with Parmesan and parsley - When the chicken and potatoes are done, sprinkle the freshly grated Parmesan cheese all over the top. Put the lid back on for a few minutes so the cheese softens and starts to melt from the heat. Finish with chopped fresh parsley right before serving. That little bit of green makes the whole crockpot look like dinner, not just something you threw together between errands.