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 cooking spray or a small amount of oil. This prevents sticking and ensures easy cleanup.

2. Whisk Together the Flavorful Sauce: In a medium bowl, combine the undrained diced tomatoes, tomato sauce, water, soy sauce, rice vinegar, brown sugar, garlic powder, and ground ginger. Whisk these ingredients together until they are well combined and the brown sugar has dissolved. This creates the rich, savory base for your dumplings.

3. Arrange the Frozen Dumplings: Pour about half of the prepared sauce mixture into the bottom of your greased baking dish, spreading it evenly. Then, arrange the frozen dumplings in a single layer over the sauce. There’s no need to thaw them first; they will cook perfectly in the oven.

4. Cover with Remaining Sauce: Pour the rest of the sauce mixture evenly over the dumplings, making sure most of them are coated. This helps them cook through and absorb all the delicious flavors.

5. Bake Until Heated Through: Cover the baking dish tightly with aluminum foil. Bake for 15 minutes. This initial covered baking period allows the dumplings to steam and cook thoroughly without drying out.

6. Add Cheese and Finish Baking: After 15 minutes, carefully remove the foil. Sprinkle the shredded mozzarella cheese evenly over the top of the dumplings. Return the dish to the oven, uncovered, and bake for another 5-10 minutes, or until the cheese is melted and bubbly and the dumplings are tender. You’ll know they’re done when the sauce is simmering and the cheese is golden brown in spots.

7. Garnish and Serve Hot: Once out of the oven, let the dish rest for a few minutes. Garnish with fresh chopped cilantro and sesame seeds, if desired, for an extra pop of flavor and visual appeal. Serve hot and enjoy!