Preheat your oven to 350°F (180°C). Line a baking sheet with parchment paper.
In a bowl, whisk together the almond flour, powdered sugar, and a pinch of salt.
In another bowl, cream the softened butter until light and fluffy. Add the eggs, vanilla extract, and almond extract, and mix until smooth.
Gradually add the dry ingredients to the butter-egg mixture, mixing until you have a smooth almond cream.
Slice the croissants lengthwise, almost all the way through, creating a pocket.
Spread the almond cream generously inside each croissant, then gently press them closed.
Spread a thin layer of almond cream on top of the croissants, then sprinkle with sliced almonds.
Place the croissants on the prepared baking sheet and bake for 12-15 minutes, or until golden brown.
After baking, let them cool slightly, then dust with powdered sugar and serve warm or at room temperature.
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