Prepare the mashed potatoes
In a skillet, brown the ground beef with onions and bell peppers over medium-high heat. Drain excess fat.
Add salt, black pepper, Worcestershire sauce, garlic powder, and onion powder. Cook for 5 more minutes.
In a separate bowl, mix flour with water to form a slurry. Pour into the skillet and stir to thicken the beef mixture.
Then add beef stock and simmer for 5 minutes until thickened further.
Transfer the cooked beef mixture to a casserole dish and spread it evenly on the bottom.
Spread the mashed potatoes evenly over the top of the beef layer.
Finally, bake in a preheated oven at 350°F (175°C) for 25-30 minutes, or microwave until the mashed potatoes are heated through and the filling is bubbling hot.
Serve and enjoy the comforting flavors of potato turbate.