I think the secret was the beef and onion soup mix - it added great flavor. I had part of a green pepper and a few lonely baby carrots in the fridge, so I threw those in, too. You could use whatever veggies you like (or none at all).
Here's the full recipe:
Tasty Turkey Meatloaf
1 1/4 lb. ground turkey (93% lean)
2-3 Tbsp. ketchup
1-2 Tbsp. Worcestershire sauce
3 Tbsp. bread crumbs
1 envelope dry beef & onion soup mix
1/4 c. chopped green onion
1/4 c. grated carrots
Preheat oven to 350 degrees.
Mix all ingredients with your hands until well blended.
Shape turkey mixture into a loaf in a 9" loaf pan.
Bake 55-60 minutes until turkey is cooked through.
Let sit 5 minutes before cutting (this keeps it from falling apart).