Creamy ham and potato soup

INGREDIENTS :
2 tablespoons olive oil
1 medium onion chopped
2 stalks of chopped celery
1 carrot, sliced into thin rounds
3 cups chopped red potatoes (jackets)
1/2 lb sweet ham cut into strips (see notes)
2 minced garlic cloves
1/2 teaspoon onion powder
2 teaspoons dried parsley
3 cups low sodium chicken broth
3 tablespoons of butter
3 tablespoons of flour
1 cup milk
Salt and pepper
INSTRUCTIONS :
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