Prepare the Potatoes: Start by bringing a large pot of salted water to a boil. Add the potatoes and cook until fork-tender, about 15-20 minutes. Drain the water and allow them to cool slightly.
Smashed Potatoes: Once the potatoes are cool enough to handle, place them on a baking sheet lined with parchment paper. Gently press down on each potato with the bottom of a glass or a potato masher until they are flattened but still in one piece.
Season the Potatoes: Melt 2 tablespoons of butter and brush over the smashed potatoes. Season with salt, pepper, and a sprinkle of paprika for a nice color. Bake the smashed potatoes at 425°F (220°C) for about 20 minutes until they are golden and crispy.
Cook the Chicken: While the potatoes bake, season the chicken thighs with salt, pepper, thyme, and rosemary. In a large skillet, melt the remaining 4 tablespoons of butter over medium heat. Add the minced garlic and sauté for about 1 minute until fragrant.
Add Chicken: Place the seasoned chicken thighs in the skillet and cook for about 6-7 minutes per side, or until the chicken is cooked through and golden brown on the outside. Baste the chicken with the garlic butter while cooking for extra flavor.
Rest and Serve: Once the chicken is cooked, remove it from the skillet and let it rest for a few minutes before slicing. Serve the chicken alongside the crispy smashed potatoes. Drizzle any remaining garlic butter from the skillet over the chicken and potatoes.
Garnish and Enjoy: Sprinkle with fresh chopped parsley for a burst of color and flavor.