Begin by browning ground turkey in a skillet until fully cooked.
Sauté diced onion and minced garlic in the skillet until softened.
Add mixed vegetables to the skillet and sauté until they're slightly tender.
Pour in turkey or chicken broth and Worcestershire sauce to create a flavorful base for the filling.
Mix in the cooked ground turkey with the vegetable and broth mixture. Allow it to simmer until the flavors meld.
Prepare mashed potatoes by mixing butter, milk, salt, and pepper into cooked and mashed potatoes.
In a baking dish, layer the turkey and vegetable filling, and then top it with a layer of creamy mashed potatoes.