Combine the milk, yeast, and maple syrup in a bowl. Let it rest until bubbly, about 15 minutes.
180 ml Milk, 15 g Active Dry Yeast, 10 g Maple Syrup
In the bowl of your stand mixer with the dough hook attachment, place the flour, 70 grams of the room temp butter, salt, sugar, and the yeast mixture.
320 g All-Purpose Flour, 70 g Butter, 6 g Salt, 35 g Sugar
Mix on low speed for 5 minutes, then on medium speed for 5 minutes.
Remove the bowl from the mixer, place plastic wrap over the bowl, and let it sit for 20 minutes.
Butter Block
Take a large sheet of parchment paper, place the remaining 180 grams of butter in the middle, and fold the paper over the top of the butter.
180 g Butter
Using your rolling pin, roll out the butter until it is about 4 mm (or 1/8 of an inch) thick. Keep the butter in the shape of a rectangle while rolling.
Place the butter (still wedged between the parchment paper) in the fridge.
First Roll of Base Dough
Place your now-rested base dough on a floured work surface.
Roll the dough into a rectangle until it is about 4 mm thick (like the butter).
Fold the rolled dough like an envelope, then cover in plastic wrap, and place in the fridge for 40 minutes.
Combining Base Dough & Butter Block
On a floured surface, place the rolled base dough and unfold it.
On one side of the rolled, and unfolded, base dough, place the butter block after removing the parchment paper surrounding it.
Close the base dough over the butter block, like a book.
Now, fold all the edges over and close tightly.
Roll the dough with your rolling pin until it is 4 mm thick, keep it in a rectangular shape.
Fold the dough like an envelope, cover in plastic wrap, and place it back in the fridge for 40 minutes.
Last Roll
On a floured surface, roll the dough, just like before. (Until 4 mm thick, always in a rectangular shape)
Now your flaky pastry dough is finished and ready to be cut/shaped into whatever your next recipe requires!