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Pat the chicken thighs dry with paper towels. Season lightly with salt and pepper.

Heat olive oil in a large skillet over medium-high heat. Sear the chicken thighs for 2-3 minutes per side until lightly browned. This step is optional but adds depth of flavor. Transfer chicken to the slow cooker.

In the same skillet (or directly in the slow cooker if it has a sauté function), add the chopped yellow onion and cook until softened, about 3-4 minutes. Add the minced garlic and cook for another minute until fragrant.

Transfer the sautéed onion and garlic to the slow cooker with the chicken. Add the chicken broth, undrained diced tomatoes, Italian seasoning, red pepper flakes (if using), kosher salt, and black pepper. Stir gently to combine.

Cover the slow cooker and cook on high for 3 hours or on low for 6 hours, or until the chicken is tender and easily shredded.

Carefully remove the cooked chicken from the slow cooker and place it on a cutting board. Shred the chicken using two forks, then return it to the slow cooker.

Stir in the heavy cream, 1/2 cup of grated Parmesan cheese, and fresh spinach. Cook for an additional 10-15 minutes on high, or until the spinach has wilted and the soup is heated through.

Taste and adjust seasoning as needed. Ladle the creamy chicken soup into bowls, garnish with extra grated Parmesan cheese and fresh chopped basil, and serve hot.


Pat the chicken thighs dry with paper towels. Season lightly with salt and pepper.

Heat olive oil in a large skillet over medium-high heat. Sear the chicken thighs for 2-3 minutes per side until lightly browned. This step is optional but adds depth of flavor. Transfer chicken to the slow cooker.

In the same skillet (or directly in the slow cooker if it has a sauté function), add the chopped yellow onion and cook until softened, about 3-4 minutes. Add the minced garlic and cook for another minute until fragrant.

Transfer the sautéed onion and garlic to the slow cooker with the chicken. Add the chicken broth, undrained diced tomatoes, Italian seasoning, red pepper flakes (if using), kosher salt, and black pepper. Stir gently to combine.

Cover the slow cooker and cook on high for 3 hours or on low for 6 hours, or until the chicken is tender and easily shredded.

Carefully remove the cooked chicken from the slow cooker and place it on a cutting board. Shred the chicken using two forks, then return it to the slow cooker.

Stir in the heavy cream, 1/2 cup of grated Parmesan cheese, and fresh spinach. Cook for an additional 10-15 minutes on high, or until the spinach has wilted and the soup is heated through.

Taste and adjust seasoning as needed. Ladle the creamy chicken soup into bowls, garnish with extra grated Parmesan cheese and fresh chopped basil, and serve hot.
