Heat the oven to 375°F. Lightly grease 8 cups of a standard muffin pan.
In a large bowl, combine the breadcrumbs and milk. Let them sit for 2 minutes so the crumbs absorb the milk.
Add the egg, minced onion, Worcestershire sauce, garlic powder, dried thyme, salt, black pepper, and 2 tablespoons of the ketchup. Stir to combine.
Add the ground turkey and mix gently until the ingredients are just combined. Avoid packing or overmixing the meat, which can make the muffins dense.
Divide the mixture evenly among the 8 prepared muffin cups. Shape each portion loosely, then spread the remaining ketchup over the tops.
Bake for 25 to 30 minutes, until the centers reach 165°F. Let the muffins rest in the pan for 5 minutes before removing and serving.