With a mandolin, cut the washed potatoes into thin slices. Add olive oil, garlic powder, thyme, rosemary, pepper and salt to the potatoes and mix everything together.
On a cutting board, lay out 2 strips of bacon that overlap vertically. Place the sliced potatoes on top, making sure that the potato slices also overlap. Carefully roll everything up into a rose. Put the rolled up strips in a greased muffin tin.
Put everything in the oven for 20 minutes. Then cover the roses with aluminum foil and bake again for another 30 minutes. Then sprinkle the roses with the fresh thyme and the parmesan and bake without a cover in 5 - 10 minutes.