Combine first 4 ingredients.
Heat oil in a large nonstick skillet over low heat for 2 minutes. Cut the pork crosswise into 16 pieces. Sprinkle evenly with salt and pepper.
Place pork in pan; cook 4 minutes on each side or until golden brown. Remove pork from pan. Stir in wine mixture, scraping to loosen browned bits. Increase heat to high; bring to a boil. Cook until reduced to 1/2 cup (about 3 minutes). Remove from heat. Stir in butter with a whisk. Serve sauce over pork. Garnish with parsley, if desired.
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