1. Preheat Your Oven and Prepare Your Baking Dish: Begin by preheating your oven to 375 F (190 C). Lightly grease a 9×13-inch baking dish with olive oil or cooking spray. This prevents sticking and makes for easier cleanup.

2. Arrange the Dumplings: Carefully place the frozen dumplings in a single layer at the bottom of the prepared baking dish. There’s no need to thaw them first; they will cook perfectly in the oven. Try to spread them out evenly so they cook consistently.

3. Prepare the Sauce Mixture: In a medium bowl, combine the diced tomatoes (undrained, as the liquid adds flavor and moisture), tomato sauce, water, olive oil, dried Italian seasoning, garlic powder, and black pepper. Stir everything together until well combined. This creates a rich, savory base for your bake.

4. Pour Sauce Over Dumplings: Evenly pour the prepared tomato sauce mixture over the frozen dumplings in the baking dish. Make sure the dumplings are mostly covered by the sauce. This helps them steam and cook through while absorbing all the delicious flavors.

5. Add the Cheese Topping: Sprinkle the shredded mozzarella cheese evenly over the top of the sauce and dumplings. Then, sprinkle the grated Parmesan cheese over the mozzarella. The cheese will melt into a golden, bubbly crust.

6. Bake Until Golden and Bubbly: Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the cheese is melted, bubbly, and lightly golden brown, and the dumplings are cooked through and tender. You’ll see the sauce bubbling around the edges.

7. Rest and Garnish: Once baked, remove the dish from the oven and let it rest for 5 minutes before serving. This allows the sauce to set slightly and prevents the dish from being too runny. If desired, garnish with fresh chopped basil or parsley for a burst of color and fresh flavor.