If you prefer to use a homemade sauce in place of the soup: In a heavy bottomed saucepan, melt 2 Tbsp butter. Add 2 Tbsp all-purpose flour and 1/4 tsp salt. Whisk in 1 cup whole milk, Cook over medium-high whisking until thickened. Add 1/2 cup sharp cheddar cheese and adjust the seasonings if needed. Proceed with the recipe as written.