We have never made hasselback potatoes before and assumed we would not need to consult a recipe for something as simple as baking a potato but somehow these managed to come out undercooked. We placed onion in between the slices of potato to hold them open and add some flavor; this ended up tasting fairly good except the parts of the onion sticking out were blackened and burnt by the time the potatoes were finished baking. If we had left them in the oven for as long as we should have, the onion would have been even more burnt so maybe that idea just wouldn't have worked anyway. We brushed with butter, seasoned with herbs de provence and added cheese on top during the last few minutes of baking so that it would melt between the cracks. I think that if we figure out a way to make this properly it could be really delicious, next time we will definitely use a recipe!