Prepare mashed potatoes.
The puree should turn out without lumps (you can use a blender for this), but I didn’t use it.
Add butter, milk, and egg to the puree. Mix everything well.
Gradually add flour. The mixture should look like very thick sour cream and resemble cream. But not liquid, otherwise the dough will flow out of the waffle iron.
Add salt and spices to the mass to taste, I added paprika and mushroom seasoning. So, I took mushroom-flavored chips.