Step 1: Prepare the Garlic Butter
In a small bowl, melt the butter and stir in minced garlic, fresh herbs, salt, and pepper. Set aside.

Step 2: Sear the Ribeye Steaks (Optional)
For added flavor, heat olive oil in a skillet over medium-high heat. Sear the ribeye steaks for 2-3 minutes per side until browned. This step is optional but will enhance the flavor and texture of the steaks.

Step 3: Prepare the Slow Cooker
Place the chicken thighs at the bottom of your slow cooker. Drizzle half of the garlic butter mixture over the chicken. Add the ribeye steaks on top, then pour the remaining garlic butter over the meats. Add chicken broth to the slow cooker to help cook the meats evenly.

Step 4: Slow Cook
Cover the slow cooker and set it on low for 4-6 hours. The chicken will become fall-off-the-bone tender, and the ribeye steaks will absorb the savory garlic butter flavors.

Step 5: Prepare the Parmesan Mashed Potatoes
While the meats cook, bring a large pot of salted water to a boil. Add the cubed potatoes and cook until tender, about 15-20 minutes. Drain and return the potatoes to the pot. Add heavy cream, Parmesan cheese, salt, and pepper, then mash until smooth. Add more cream or butter if you prefer a creamier texture.

Step 6: Serve
Once the chicken and ribeye are cooked, remove them from the slow cooker. Serve the meats alongside the Parmesan mashed potatoes. Drizzle some of the garlic butter sauce from the slow cooker over the potatoes for extra flavor.