Season breasts with salt and pepper. Heat oil in a skillet over medium-high heat and brown breasts on one side, about 3 minutes. Flip breasts over. Cook for 1 minute more. Add wine and garlic and stir into pan to loosen bits of duck. Cook for 2 minutes. Remove duck and let stand for 2 minutes while finishing sauce. Stir remaining ingredients except parsley into pan and cook for 2 minutes. Slice duck, spoon sauce over and top with parsley.