Step 1

In a large stockpot melt butter over medium-high heat, until it starts to bubble, about 1 minute. Add onion and sauté until soft and tender and starting to brown, about 3-4 minutes.

Step 2

Add flour and mix well until evenly combined with the onion mixture and continue to cook for another minute. Pour in stock and Italian seasoning and mix well. Bring the mixture to a simmer, about 3-4 minutes,

Step 3

Add in mashed potatoes and Parmesan cheese. Mixing until all the potatoes have broken up and the cheese has melted. Season with salt and pepper to taste. Let the soup simmer over medium heat for 8-10 minutes until thickened to a desired consistency, stirring occasionally.

Step 4

Ladle into bowls and top with shredded cheddar cheese.