In a bowl, mix all the meat pie ingredients (except the oil). Mix until well combined and shape into 4 oval or round discs that flatten the center for even thickness throughout.
Heat 1 tablespoon oil in a non-stick frying pan, once hot, add the pancakes to the pan and cook until golden brown on both sides and cooked through. Remove the pancakes from the pan and cover to keep them warm.
Fry the onions (you can also chop the onions into thin slices, whatever your personal preference) in the same skillet. Once the onions are soft, add the garlic and butter and mix.
Add mushrooms and saute until they turn brown, mixing frequently. Season a little with salt and pepper.
In a bowl, whisk all remaining broth ingredients together: 2 Tbsp flour, 1 1/2 cups broth, 1/2 cup water, 1/2 tsp Worcestershire, 1/2 tsp Dijon, 2 tsp ketchup, 1/4 tsp. 1 teaspoon salt and 1/8 teaspoon pepper. Pour in mushrooms and cook until the broth thickens.
Add the pancakes back to the pan, cover them completely with the broth and mushrooms, and cook until the pancakes are heated through.