Start by mixing flour and salt, then incorporate cold butter until crumbly. Add sourdough discard and water, mixing until a dough forms. Shape it into a rectangle and chill it to keep the butter firm and ready for layering.
Roll the dough into a rectangle and fold it like a letter, then chill again. Repeat this folding process a few times to build those signature flaky layers. Keeping everything cold is key to achieving that perfect texture.
In a bowl, mix almond flour, sugar, egg, almond extract, and vanilla extract. Stir until smooth and creamy. This filling should be rich but spreadable so it evenly coats the dough.
Roll the chilled dough thinly and spread the almond filling across it, leaving a small border. This prevents overflow while baking and keeps the layers neat and defined.
Cut the dough into strips and roll each one into a spiral shape like a snail. Place each spiral into a greased muffin tin. This shape helps create the classic cruffin look with visible layers.
Sprinkle slivered almonds on top and bake in a preheated oven at 375°F (190°C). Bake until golden brown and crisp on the outside while remaining soft inside.
Let them cool slightly, then dust with powdered sugar. Serving them warm really brings out the buttery layers and creamy almond filling.