Preheat the oven to 375°F. Line an 8" x 8" square pan with parchment paper or aluminum foil and grease with butter or non-stick cooking spray.
Stir together the crumbs, sugar, salt, cinnamon, and melted butter.
Press into the bottom of an 8" x 8" square pan.
Bake the crust for 8 to 10 minutes, until set; the color won't change much.
Remove the crust from the oven and cool for a few minutes while you lower the oven temperature to 300°F.