First, whisk the egg and milk together in a medium sized bowl until well combined.
Add the sourdough starter, flour, salt, lard, and baking soda. Mix with a spatula or spoon until well combined. I like to finish combining the ingredients with my hands until I have a smooth dough.
If you want to let your dough ferment, you can do so on the counter for 6-10 hours until or up to 24 hours in the refrigerator.
When you are ready to make the dumplings, prepare your broth and chicken to your liking. Make sure the broth has come to a boil before adding your dumplings.
Lightly flour your countertop or large cutting board. Roll the dough out to a thickness of about 1/8 inch. Cut dumplings to the size of your choice. Tip: I like to use a pizza cutter to make this step super quick and easy.
Dust all the dumpling pieces lightly with flour. Add them one at a time to the boiling broth. Cook for 10-15 minutes until the dumplings begin to sink to the bottom of the pot.
Enjoy!