To blanch carrots and celery, bring 1 inch of water to a boil in a medium sauce pot with a steamer basket. Steam vegetables for 2-3 minutes. Drain immediately and soak in a bowl of ice water for 2-3 minutes.
Combine the cooked chicken, carrot, celery and peas in a bowl and keep on the side.
Sweat the butter, garlic and onions in a large sauce pot over medium heat until onions are translucent and tender, and the garlic is fragrant.
To start the roux, mix the flour, salt, and pepper into a small bowl, then stir into butter mixture vigorously to prevent burning and clumping.
Drizzle in the chicken stock and mix until fully incorporated.
Bring the mixture back to a boil to fully cook the flour, about 3-5 minutes, then stir in the cream off the heat.
Adjust seasoning to taste.
Add in the chicken and vegetable mix into soup and bring to a simmer.
Gather all the dry ingredients for the dumpling in a bowl while soup is coming to a simmer.
Make a well in the center of the dry ingredients and pour the cream into the well.
Mix with a spatula until dough comes together. Do not overmix or the dough will become tough.
Divide the dough into quarter size balls.
Add the dumplings to the soup and simmer for 15 minutes, covered.
Enjoy immediately, or store in quart containers or mason jars for a delicious meal prep for the week!