01 -
Warm the chicken broth and milk until they are no longer cold. This helps them blend into the roux without lumps.
02 -
Melt the butter in a medium saucepan over medium heat. Add the flour and whisk for 2-3 minutes until smooth, pale golden, and lightly toasty.
03 -
Add the warm chicken broth slowly, about 1/2 cup at a time, whisking until smooth before adding more.
04 -
Whisk in the milk, bouillon, onion powder, garlic powder, celery seed, black pepper, and salt.
05 -
Cook over medium-low heat for 5-7 minutes, whisking often, until the soup is thick, glossy, and coats the back of a spoon.
06 -
Stir in shredded chicken if using. Taste and adjust salt. Use thick as a condensed soup substitute or thin with extra broth for serving.