1. Preheat the oven to 400 F (200 C).

2. Heat olive oil in a large skillet over medium-high heat.

3. Add ground beef and season with onion powder, garlic powder, paprika, salt, and pepper, then cook until browned and no pink remains, about 4 to 5 minutes.

4. Stir in frozen mixed vegetables and beef broth, then simmer until the liquid reduces and vegetables are tender, about 3 to 4 minutes.

5. Transfer the beef and vegetable mixture to a baking dish and spread evenly.

6. Spoon mashed potatoes over the filling and smooth the top. Sprinkle cheese if using.

7. Bake for 5 to 7 minutes until the top begins to brown. For a crispier crust, broil for 1 to 2 minutes, watching closely.

8. Let rest for 2 to 3 minutes before serving.