Combine orange juice, orange peel, thyme and pepper in a small mixing bowl; mix well and reserve.
Place lamb chops in a 13x9x2-inch baking dish; spoon orange juice mixture over chops. Cover with plastic wrap; refrigerate for 3 hours.
Heat a large skillet on medium-high heat. Remove chops from marinating liquid; reserve liquid. Brown chops on both sides in hot skillet, about 5 minutes per side. Remove chops from skillet; set aside and keep warm.
Melt butter in skillet over medium heat. Sauté mushrooms until tender, 5 to 7 minutes. Stir in reserved marinade and white wine. Return chops to skillet; cover, reduce heat; simmer for 10 minutes. Uncover and simmer for 10 minutes more or until sauce is thickened.
Servings: 2