Cook noodles and drain. Brown ground beef. Add tomato sauce and sugar and remove from heat. Combine cottage cheese, sour cream, cream cheese, green onion, and bell pepper in a bowl. In a 9x13 pan, spread half of the noodles on the bottom of pan. Cover with cheese mixture. Then cover with rest of noodles. Pour melted butter over noodles and top with meat/tomatoes mixture. Bake 375 degrees for 45 minutes.