Preheat your oven to 400°F (200°C).
In a large skillet, cook the ground meat over medium heat until browned.
Add the chopped onion and garlic; sauté until translucent.
Stir in the diced carrots and cook for another 5 minutes.
Add the peas, tomato paste, beef broth, Worcestershire sauce, salt, and pepper.
Simmer for about 10 minutes until the mixture thickens.
Transfer the meat mixture to a baking dish, spreading it evenly.
Spoon the mashed potatoes over the meat mixture, smoothing the top.
If desired, sprinkle shredded cheese on top.
Bake for 25-30 minutes or until the top is golden brown.