Sweet Potato Ravioli with Lemon-Sage Butter

1 (1-pound) sweet potato
2 T grated fresh Parmesan Cheese
1/2 tsp. salt, divided
1/4 tsp. ground cinnamon
1/8 tsp. ground nutmeg
24 wonton wrappers
1 large egg white, lightly beaten
6 quarts water
Cooking spray
3 T butter
1 T chopped fresh sage
1 T fresh lemon juice
1/8 tsp. freshly ground black pepper
Sage sprigs

1. Preheat oven to 400 degrees
2. Pierce potato several times with a fork; place on a foil-lined baking sheet. Bake at 400 degrees fro 40 minutes or until tender. Cook. Peel potato; mash. Combine potato, cheese, 1/4 tsp. salt, cinnamon, and nutmeg in a small bowl.
3. Working with 1 wonton wrapper at a time (cover remaining wrappers with a damp towel to keep them from drying), spoon 1 T potato mixture into center of each wrapper. Brush edges of dough with egg white; bring 2 opposite corners to center. Press edges together to seal, forming a triangle. Repeat procedure with remaining wonton wrappers, potato filling, and egg white.
4. Bring 6 quarts water to a boil. Add 8 ravioli; cook 2 minutes or until done. Remove ravioli from pan with a slotted spoon. Lightly coat cooked wontons with cooking spray; keep warm.. Repeat procedure with remaining ravioli.
5. Melt butter in a small skillet over high heat. Add chopped sage to pan;cook 1 minute or until butter is lightly browned. Stir in remaining 1/4 tsp. salt, juice and pepper. Drizzle butter mixture over ravioli. Garnish with sage sprigs, if desired.