Winter Squash Lasagna with Brown Butter Béchamel

Name: Winter Squash Lasagna with Brown Butter Béchamel
Ingredients: 2 sm. butternut squash (about 4 lbs. total), peeled, seeded and cut into 1/4-in.-thick slices; 2 tbsp. olive oil; 1/4 tsp. ground cinnamon; 1/4 tsp. ground nutmeg; 1/2 c. (1 stick) butter; 1/2 c. all-purpose flour; 5 c. low-fat (1%) milk; 2 cloves garlic, finely chopped; 8 med. leaves sage, finely chopped, plus leaves for garnish; 1 c. grated Pecorino cheese; 12 no-boil lasagna noodles; 2 c. shredded Mozzarella cheese; Chopped toasted hazelnuts, for garnish