Preheat the oven to 350°F. Line an 8×8-inch baking dish with parchment paper, leaving a slight overhang for easy removal.
In a medium bowl, stir together the flour, melted butter, and sugar until combined.
Press the mixture evenly into the bottom of the prepared pan.
Bake for 15-20 minutes, or until the crust is lightly golden. Remove from the oven and allow it to cool completely.