In a large ovenproof skillet over medium-high heat, heat oil. Season chicken with salt and pepper and cook until golden and no longer pink, 8 minutes per side. Transfer to a plate. Discard half the chicken juice from skillet and reduce heat to low.
Step 2
To skillet, add butter, garlic, white wine, lemon juice, and capers and bring to a simmer. Add lemon slices and return chicken thighs to skillet. Let the chicken simmer in sauce 5 minutes, then garnish with parsley before serving.