INGREDIENTS
2
leeks, finely chopped (white part only)
1 clove
garlic, finely chopped
4
medium potatoes (red or Yukon Gold), chopped
2 tbsp
butter, divided
1 tbsp
olive oil
1 1/2 tsp
ground mustard
2 tbsp
flour
1/2 cup
water
3 cups
chicken broth
salt, pepper, and celery salt,
1/2 cup
shredded Cheddar cheese
2 tbsp
Parmesan cheese
1 cup
milk
3 oz
chopped portobello mushrooms
croutons for garnish, if desired