Cheesy chicken and vegetable soup

grated carrots
sliced celery
chopped onion
1/2 cube butter
1/4 c flour
1 can evaporated milk
8 c chicken broth
wild rice- cooked
chicken breasts- cooked and shredded

melt butter and add flour to create a roux. Add evaporated milk and broth. Add vegetables and cook until crisp/tender. Add chicken and wild rice. Heat through and serve.