Creamy Crock Pot Potato Soup

potatoes (shredded (I used 1 pkg Simply Potatoes Shredded Hashbrowns))

chicken broth (low sodium, 2 14.5 oz cans)

salt (to taste)

black pepper (to taste)

red pepper flakes (to taste)

whole milk

all-purpose flour

sour cream (plus more for topping)

shredded cheddar cheese (plus more for topping)

veggies (your choice (optional))

meat (your choice (optional))

chives (fresh and chopped)