Creamy Pumpkin Pasta with Parmesan & Sage Recipe

whole wheat pasta (I used penne) 2 tsp. olive oil 2 shallots, diced 1 clove garlic, minced 1 Tbs. fresh sage + more for garnish 1 (15-ounce) can pumpkin puree 1/4 cup Parmesan cheese + more for garnish 1/2 tsp. ground nutmeg 1/2 cup pasta cooking water