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Make the Meatballs
Preheat oven to 400°F (200°C).
In a large bowl, combine ground beef, grated onion, breadcrumbs, egg, garlic, salt, black pepper, and cumin. Mix until well combined.
Shape the mixture into 16 medium-sized meatballs and gently press the center of each one to create a shallow cup shape for the mashed potatoes.
Place the meatballs in a lightly greased baking dish and bake for 20–25 minutes, until mostly cooked and lightly browned.
Make the Mashed Potatoes
Meanwhile, boil or steam the potatoes until fork-tender, about 15–20 minutes.
Mash the potatoes with warm milk, butter, cheese, and salt until smooth and creamy.
Make the Tomato Sauce
In a small saucepan, whisk together olive oil, tomato sauce, water, salt, and black pepper. Simmer for 4–5 minutes.
Assemble, Bake, and Serve
Remove the meatballs from the oven. Spoon mashed potatoes onto each meatball.
Pour the tomato sauce around the meatballs in the baking dish.
Sprinkle cheese over the mashed potatoes.
Return to the oven and bake for another 15 minutes, until the cheese is melted and lightly golden.
Serve warm with rice, salad, or crusty bread. Bon appétit.