Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
In a bowl, combine the flour, sugar, salt, and ground coffee.
In a separate bowl, warm the milk until lukewarm. Add the yeast and let it stand for 5 minutes.
Add the eggs, lukewarm milk-yeast mixture, espresso, and vanilla extract to the flour mixture. Begin to combine the ingredients.
Crumble the cold butter into the mixture and knead until you have a smooth, elastic dough.
Roll out the dough to about 1/8 inch (3 mm) thickness and cut it into equal-sized triangles.
Roll up the triangles into croissant shapes and place them on the prepared baking sheet.
Let the croissants proof for 20 minutes to allow them to become lighter and fluffier before baking.
Brush the tops with egg and bake for 18-20 minutes, or until golden brown and crispy.
Once cooled, sprinkle with a little extra ground coffee or powdered sugar before serving.
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