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In a large pot or Dutch oven, melt the butter over medium heat. Add the chopped yellow onion and sauté until softened and translucent, about 5 to 7 minutes.

Add the leftover mashed potatoes to the pot. Break them down with a spoon or spatula and stir them into the softened onions and butter until well combined.

Pour in the chicken broth and add the chicken bouillon cubes. Stir continuously, breaking up any remaining potato lumps, until the mixture becomes creamy and smooth. Bring to a gentle simmer.

Reduce the heat to low. Add the white cheese slices and yellow cheese slices to the soup. Stir constantly until all the cheese is fully melted and incorporated, creating a smooth, cheesy consistency.

Stir in the sour cream until fully blended. Add a few drops of hot sauce, if desired, and mix well. Taste and adjust seasoning with salt and black pepper as needed.

Ladle the hot soup into bowls. Garnish with shredded cheddar cheese, crumbled bacon, and fresh chopped chives, if using. Serve immediately.


In a large pot or Dutch oven, melt the butter over medium heat. Add the chopped yellow onion and sauté until softened and translucent, about 5 to 7 minutes.

Add the leftover mashed potatoes to the pot. Break them down with a spoon or spatula and stir them into the softened onions and butter until well combined.

Pour in the chicken broth and add the chicken bouillon cubes. Stir continuously, breaking up any remaining potato lumps, until the mixture becomes creamy and smooth. Bring to a gentle simmer.

Reduce the heat to low. Add the white cheese slices and yellow cheese slices to the soup. Stir constantly until all the cheese is fully melted and incorporated, creating a smooth, cheesy consistency.

Stir in the sour cream until fully blended. Add a few drops of hot sauce, if desired, and mix well. Taste and adjust seasoning with salt and black pepper as needed.

Ladle the hot soup into bowls. Garnish with shredded cheddar cheese, crumbled bacon, and fresh chopped chives, if using. Serve immediately.
