1 Line a large baking sheet with parchment paper. Cook sweet potatoes in microwave on high until tender, about 5 minutes per side. Cut in half and cool. 2 Scrape sweet potato flesh into a medium bowl and mash. Take 3 cups mashed sweet potatoe and mix with ricotta cheese in a large bowl. 3 Add Parmesan cheese, brown sugar, 2 teaspoons salt and nutmeg, mix to blend. 4 Mix in the flour about 1/2 cup at a atime until dough forms. Turn dough onto a floured surface, divide into 6 equal pieces. 5 Rolling between palms and floured work surface, form each piece into 20-inch-long rope (about 1 inch in diameter), sprinkling with flour as needed if sticky. 6 Cut each rope into 20 pieces. Roll each piece over tines of fork to indent. Transfer to baking sheet. 7 Bring large pot of water to a boil and add 2 tablespoons salt. Working batches, boil gnocchi until tender, 5 to 6 minutes. Transfer gnocchi to clean rimmed baking sheet. Cool completely. (can be made ahead or frozen)8 Preheat oven to 300°F. Melt butter in a heavy large saucepan over medium-high heat. Cook until butter solids are brown and have toasty aroma, swirling pan occasionally, about 5 minutes. 9 Add chopped sage. Turn off heat and season wtih salt and pepper. 10 Transfer half of sage butter to large skillet over medium-high heat. Add half of the gnocchi. Saute until gnocchi are heated through, about 6 minutes. Empty skillet onto rimmed baking sheet; place in oven to keep warm. Repeat with remaining sage butter and gnocchi. Garnish with sage laves.