Heat Oil in large nonstick skillet over medium heat. Add onions; cook slowly until golden and carmelized, about 20 to 25 minutes, stirring occasionally.
Combine goat cheese and milk in small bowl; stir until well blended, set aside.
Cook pasta according to package direction, omitting salt. Drain and set aside.
Add garlic to onions in skillet; cook until softened, about 3 minutes. Add wine, sage, salt and pepper; cook until moisture is evaporated. Remove from heat; add pasta and goat cheese mixture, stirring to melt cheese. Sprinkle with walnuts.