Preheat your oven to 375°F (190°C) and lightly grease a 9x13 inch baking dish. In a large bowl, combine the flour, baking powder, and salt for the dumpling mixture.

In a separate bowl, whisk together the milk and melted butter, then add the wet ingredients to the dry ingredients, mixing until just combined to form a soft dough.

In a large skillet over medium heat, brown the ground meat and drain any excess fat. Add the chopped onion and minced garlic, cooking until softened.

Stir in the vegetable broth, frozen mixed vegetables, soy sauce, and sesame oil, bringing the mixture to a simmer.

Drop spoonfuls of the dumpling dough over the simmering filling in the skillet, then transfer the entire mixture to your prepared baking dish.

Bake for 25-30 minutes, or until the dumplings are golden brown and cooked through, and the filling is bubbly.