Meanwhile, heat oven to 375°F. In large saucepan or Dutch oven, brown ground turkey with onion and garlic; drain if necessary. Stir in sugar, oregano, basil, salt, pepper, tomatoes, tomato paste and mushrooms. Bring to a boil. Reduce heat; cover and simmer 20 minutes, stirring occasionally. Remove from heat; stir in cooked spaghetti.