Add ¾ cup of the broth and bring it to a slight simmer. Pour the remaining ¼ cup broth in a bowl on the side with the seasonings. Then measure out the flour, keep to the side.
Once the broth on the stove comes to a simmer, pour the flour into the ¼ cup of broth in the bowl. Whisk vigorously to combine and remove the lumps.
Pour this thickened broth into the simmering broth on the stove. Whisk vigorously to combine and remove the lumps.