What if we told you the secret to ultra-creamy soup was your favorite condiment?

Trust usit sounded unbelievable to us, too.

But in just one spoonful we were convinced.

Southern Living Potato Leek and Roasted Garlic Soup

Credit:Greg DuPree, Food Stylist: Emily Nabors Hall, Prop Stylist: Christine Keely

The soup was luscious and creamy without any heaviness from the condiment.

Our best guess in the mayonnaise coats the tiny grains of potato, yielding a velvety smooth texture.

Or maybe… it was magic.

Trim tops of garlic heads so that tops of cloves are exposed.

Place on a large piece of aluminum foil; drizzle with olive oil.

Sprinkle with 1/2 teaspoon of the salt; wrap garlic in foil and seal tightly.

Place on a baking sheet.

Bake until garlic is soft, about 45 minutes.

Remove from oven; open foil, and let stand 5 minutes.

Squeeze garlic cloves from heads into a small bowl; set aside.

While garlic cools, melt butter in a large saucepan over medium.

Add leeks, and cook, stirring occasionally, until starting to soften, about 3 minutes.

Add potatoes and 1/2 teaspoon of the salt, and cook, stirring occasionally, about 2 minutes.

Add chicken broth; bring to a boil over medium-high.

Transfer potato mixture and roasted garlic to a blender.

Secure lid on blender, and remove center piece to allow steam to escape.

Place a clean towel over opening.

Process until smooth, about 30 seconds.

Pour mayonnaise mixture into blender along with remaining 1/2 teaspoon salt; blend until smooth.

Top with pepper, thyme, and croutons, and serve immediately.