Preheat your oven to 350°F (180°C). Line a baking sheet with parchment paper.
Melt the butter in a small saucepan. Stir in the brown sugar, cinnamon, vanilla extract, and a pinch of salt.
Slice the croissants in half lengthwise, being careful not to cut all the way through, creating a pocket.
Spread the cinnamon-butter mixture inside the croissants, then gently press them closed.
Brush the tops of the croissants with a thin layer of the cinnamon-butter mixture.
Place the croissants on the prepared baking sheet and bake for 8-10 minutes, or until the cinnamon sugar is slightly caramelized.
After baking, let them cool slightly, then dust with powdered sugar. Serve warm or at room temperature.
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