How do I make it thicker like real pot pie filling?
Two easy moves: (1) let the soup simmer uncovered for 5 to 10 minutes after the potatoes are tender, and (2) mash a few potato cubes against the side of the pot to naturally thicken it. If you want it extra thick, add an extra 1 tablespoon flour when you make the roux.
Can I use rotisserie chicken?
Absolutely. It is the fastest path to a great pot pie soup. Add it near the end so it stays tender, not overcooked and stringy.
Can I make this gluten-free?
Yes. Swap the flour for a gluten-free all-purpose flour blend (one meant for 1:1 substitution), but know the thickening power varies by brand. If it looks thin, simmer uncovered a few extra minutes. If you want a reliable backup, skip the flour and thicken at the end with a cornstarch slurry (1 tablespoon cornstarch mixed with 2 tablespoons cold water), added while simmering.
Can I use frozen vegetables?
Yes. Frozen peas are perfect. For carrots and celery, fresh tastes best, but frozen mixed vegetables work in a pinch. Add frozen veg toward the end so it does not get mushy.
Why did my soup turn grainy after adding cream?
High heat is the most common culprit, especially if the soup is boiling when dairy goes in. Graininess can also happen with lower-fat dairy, boiling after adding dairy, or adding acidic ingredients too early. Keep the soup at a gentle simmer, add cream near the end, and add lemon juice off the heat. If it happens, a quick blend with an immersion blender can smooth it out.