First of all, prepare the dough: put the flour and the yeast dissolved in the water in a bowl and start kneading.
Then also add butter and sugar and knead until you get a homogeneous dough, which you will leave to rise for at least 2 hours or until doubled.
When the dough has risen (do not do it before, or they will tend to darken due to oxidation), peel the apples and cut them into thin slices.
Take the dough, deflate it with your hands and roll it out into a round sheet, with which you will cover the bottom of the mold, lightly greased or lined with parchment paper.
Add the apples by creating a decoration, for example by placing them in concentric circles.
Finally sprinkle with brown sugar and flaked butter and bake at 180 ° C in a preheated static oven for 15 minutes on the lowest shelf of the oven and then for another 10-15 minutes on a medium-high shelf.
The apple focaccia is ready, let it at least cool down before serving.
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