2Melt garlic butter in a large skillet over medium heat until it stops foaming. Add chicken and cook until golden brown, 6 to 8 minutes per side. Season with salt and pepper. Remove to a platter and cover to keep warm.
3Cook mushrooms in remaining butter in the skillet until beginning to turn brown at the edges, 5 to 7 minutes. Stir in wine, demi-glace, lemon juice, and capers. Reduce the heat to a simmer, season with salt and pepper, and stir in parsley.