Potato soup

1 T olive oil
1 T butter
1/2 cup onion, diced
1/2 cup celery, sliced
2 cloves garlic, minced
1 carrot, sliced fine
2 slices bacon, 1 inch pieces
1 T ground chia seed
3 cups broth or stock, chicken or vegetable
4 cups potatoes
2 carrots, medium sliced
1 cup meat (optional), larger dice
rosemary
thyme
basil
tarragon
2 cups milk