Cut the cooked potatoes into bite-sized pieces and place them in a bowl.
Dice the courgette, slice the spring onions and cut the fresh pepper into small pieces. If using jarred roasted pepper, drain and slice it instead.
Heat a little olive oil in a frying pan. Add the fresh pepper and courgette and sauté for about 5 minutes, until slightly softened.
Stir in the mixed herbs, artichoke hearts, spring onions and garlic. If using jarred roasted pepper, add it at this stage instead.
Cook for another minute, then add the potatoes, lemon juice and toss gently until warmed through. Season with salt and freshly ground black pepper.
Transfer to a serving bowl and crumble your choice of cheese over the top, if using. Serve warm.