In a medium bowl, whisk together all-purpose flour, ground cinnamon, baking powder, and salt until well combined. Set aside.

In a small bowl, combine instant coffee granules with vanilla extract. Mix until fully dissolved.

In a large mixing bowl, beat together melted unsalted butter and brown sugar until smooth. Add egg and coffee mixture, stirring until well incorporated.

Gradually add dry ingredient mix into wet mixture using a spatula, stirring gently until just combined.

Cover the mixing bowl with plastic wrap and refrigerate the dough for 30 minutes.

Scoop the dough into small balls, roll in granulated sugar, then in powdered sugar.

Place the sugar-coated balls on a parchment-lined baking sheet and bake in a preheated oven for 10 to 12 minutes.

Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.