Florentine Lasagna Roll-Ups
["12 fluted lasagna noodles", "2 Tbsp. butter", "3/4 c. chopped onion", "2 (10 oz. each) pkg. frozen spinach, thawed and well drained", "1 1/2 c. (6 oz.) shredded Mozzarella cheese", "1/2 c. grated Parmesan cheese", "1/2 c. dairy sour cream", "1 egg, slightly beaten", "1/4 c. butter", "1/4 c. flour", "1 1/2 tsp. instant chicken bouillon", "1/8 tsp. pepper", "1 c. light cream", "1 c. milk"]
["Preheat oven to 350\u00b0.", "Cook lasagna noodles.", "Cool in large bowl of cold water; set aside.", "Saute onions in 2 tablespoons butter until tender."]
["lasagna noodles", "butter", "onion", "frozen spinach", "Mozzarella cheese", "Parmesan cheese", "sour cream", "egg", "butter", "flour", "instant chicken", "pepper", "light cream", "milk"]