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Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper for easier cleanup.
In a large bowl, toss the cubed potatoes, chicken pieces, and sliced leeks with 1 tablespoon of olive oil, 1/2 teaspoon of salt, and 1/4 teaspoon of black pepper. Spread them in a single layer on the prepared baking sheet.
Roast the potatoes, leeks, and chicken for 35 to 40 minutes, or until potatoes are tender, leeks are lightly browned, and chicken is cooked through (internal temperature 165°F), flipping halfway through. Set aside a small amount of roasted leeks for garnish, if desired.
While the vegetables and chicken are roasting, heat the remaining 2 tablespoons of olive oil in a large pot or Dutch oven over medium heat. Add the chopped yellow onion and cook, stirring occasionally, until softened and translucent, about 5 to 7 minutes.
Add the minced garlic to the pot and cook for 1 minute more until fragrant, being careful not to burn it.
Once roasted, transfer the potatoes and leeks to the pot with the onion and garlic. Set aside the roasted chicken pieces for later. Pour in the vegetable broth, remaining 1/2 teaspoon of salt, and 1/4 teaspoon of black pepper. Bring the mixture to a simmer.
Reduce the heat to low, cover, and let the soup simmer for 15 to 20 minutes to allow the flavors to meld.
Carefully purée the soup directly in the pot using an immersion blender until smooth. Alternatively, transfer the soup in batches to a regular blender and blend until smooth. If using a regular blender, be sure to vent the lid to allow steam to escape and avoid pressure buildup.
Stir in the roasted chicken pieces and heavy cream, if using, and heat through for 1-2 minutes without boiling. Taste and adjust seasoning with additional salt and pepper as needed.
Ladle the hot soup into bowls. Garnish with fresh chopped thyme and the reserved roasted leeks, if desired, before serving.

Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper for easier cleanup.
In a large bowl, toss the cubed potatoes, chicken pieces, and sliced leeks with 1 tablespoon of olive oil, 1/2 teaspoon of salt, and 1/4 teaspoon of black pepper. Spread them in a single layer on the prepared baking sheet.
Roast the potatoes, leeks, and chicken for 35 to 40 minutes, or until potatoes are tender, leeks are lightly browned, and chicken is cooked through (internal temperature 165°F), flipping halfway through. Set aside a small amount of roasted leeks for garnish, if desired.
While the vegetables and chicken are roasting, heat the remaining 2 tablespoons of olive oil in a large pot or Dutch oven over medium heat. Add the chopped yellow onion and cook, stirring occasionally, until softened and translucent, about 5 to 7 minutes.
Add the minced garlic to the pot and cook for 1 minute more until fragrant, being careful not to burn it.
Once roasted, transfer the potatoes and leeks to the pot with the onion and garlic. Set aside the roasted chicken pieces for later. Pour in the vegetable broth, remaining 1/2 teaspoon of salt, and 1/4 teaspoon of black pepper. Bring the mixture to a simmer.
Reduce the heat to low, cover, and let the soup simmer for 15 to 20 minutes to allow the flavors to meld.
Carefully purée the soup directly in the pot using an immersion blender until smooth. Alternatively, transfer the soup in batches to a regular blender and blend until smooth. If using a regular blender, be sure to vent the lid to allow steam to escape and avoid pressure buildup.
Stir in the roasted chicken pieces and heavy cream, if using, and heat through for 1-2 minutes without boiling. Taste and adjust seasoning with additional salt and pepper as needed.
Ladle the hot soup into bowls. Garnish with fresh chopped thyme and the reserved roasted leeks, if desired, before serving.