Heat oil in a medium skillet over high heat. Add mushrooms; cook 6-7 minutes, stirring often, until mushrooms are deep brown in color. Carefully pour in red wine and cook until completely evaporated, about 2-3 minutes. Add butter and cook until melted. Remove from heat and season with salt and pepper.
Pour mushrooms and butter over ravioli. Sprinkle with parmesan cheese and parsley before serving.