In a small mixing bowl, mix flour, baking powder, salt, and Italian seasoning until combined. Add milk and oil and stir until combined. The batter will be thick. Set aside.
In a large pot, add onions, potatoes, mixed vegetables, and broth.
Bring to a boil, reduce the heat to medium, then carefully drop the dumpling mixture, 1 tablespoon at a time, into the soup. Cover, reduce heat to low, and cook for 12-15 minutes or until dumplings are cooked through and potatoes are fork tender. Dumplings are cooked through when a toothpick comes out clean.
Serve and enjoy!