Not to belabour the point, but the recipe in the link has both pepper and paprika in it.

Personally I wouldn’t put paprika in a bubble and squeak, but I would put mustard powder in it. I also personally favour the “as much black pepper as you can get in there before it becomes inedible” approach, although having kids has made me dial that one down a bit. Also a pinch of herbs doesn’t go amiss; rosemary and thyme both work well.

These things are as bland or not as you want them to be. Certainly fried potato and bacon doesn’t really need to be more than it is.