Preheat the oven to 375°F. In a bowl, combine the ground beef with the egg, garlic, half of the spices, salt, and olive oil. Mix well, form into meatballs, and bake for 30 minutes.

Meanwhile, slice the potatoes and mix them with the remaining spices and a bit of olive oil. Set aside.

Slice the tomatoes and bell pepper. Remove the meatballs from the oven and top with the potatoes, bell pepper, tomatoes, and two tablespoons of tomato sauce. Return to the oven for another 30 minutes.

After 30 minutes, check if the vegetables are cooked and serve.