Creamy Onion Soup

Simpler than a classic French onion and lighter than a potato-leek, this is weeknight comfort-soup territory. A pound of sliced yellow onions goes soft and sweet in butter (don’t rush this, 10 slow minutes over medium heat builds real depth), then simmers in chicken broth with just a dash of thyme to draw out herbal warmth.

The creamy finish avoids heavy cream entirely. Whole milk does the enriching, and a flour slurry whisked into the last portion of cold milk is what thickens the soup to velvety texture. Slurrying with cold milk, not hot broth, is important: hot liquid can seize the flour into lumps, while cold milk disperses starch evenly before it meets heat.

Boil the soup for the full 2 minutes after the slurry goes in. Undercooked flour tastes raw and grainy; a proper two-minute boil cooks out the starchy flavor and sets the body.

Kitchen Tips

• Slice onions pole-to-pole (not root-to-tip) for tender strips that hold shape while softening.
• Use a heavy-bottomed pot to avoid scorching the milk on the bottom.
• Stir constantly during the final boil to prevent the flour from clumping or sticking.
• Taste at the end, chicken broth varies in sodium and you may not need added salt.

Variations

• Caramelize the onions longer (25 to 30 minutes) for a deeper, French-onion-style base.
• Stir in ½ cup grated Gruyere or Swiss cheese for a rich, cheesy finish.
• Top bowls with croutons and a sprinkle of fresh chives for added texture.