Preheat the oven to 350°F (175°C).
Melt butter in a pan over medium heat.
Sauté chopped onions until translucent, about 5 minutes.
In a large bowl, combine ground turkey, sautéed onions, eggs, cheddar cheese, salt, pepper, tomato sauce, Worcestershire sauce, and crushed saltine crackers.
Gently mix without overworking the meat.
Shape the meat mixture into a loaf in a loaf pan.
Drizzle the top with ketchup.
Bake for about an hour until it reaches 165°F (74°C) internally.
Let it rest for a few minutes after baking.
Slice and serve warm.
Enjoy your delightful Joanna Gaines meatloaf!