
Place the pan in the oven and blind bake the crust for 20 minutes.
Place half of the potatoes in a bowl. Toss with the sour cream and Gouda cheese.
Chop half of the fried sage into pieces and add to the mixture.
Season again with kosher salt and freshly ground black pepper to taste.
Transfer the potato mixture to the pan (remove the parchment paper). Lay the remaining potato slices on top.
Place in the oven and bake for 20 minutes, until the crust is golden brown.
Remove from the oven and let cool for 15 minutes. Garnish with the remaining fried sage. Slice and serve.