The classic magic bar with a fall makeover: buttery crust, spiced pumpkin condensed milk, coconut, pecans, and chocolate. Easy to assemble. Chill before you slice.
Prep the pan. Heat the oven to 350°F. Line a 9×13-inch pan with foil or parchment, leaving overhang on the long sides. Lightly grease the lining.
Make the crust. Stir the crumbs and melted butter until evenly moistened. Press firmly into an even layer on the bottom of the pan (use the bottom of a measuring cup).
Pumpkin mixture. Whisk condensed milk, pumpkin, pumpkin pie spice, and a pinch of salt until smooth.
Layer. Pour the pumpkin mixture over the crust and spread to the edges. Sprinkle 1 cup coconut evenly over the top. Add nuts and chocolate chips. Finish with the remaining ½ cup coconut. Do not stir.
Bake. 32–35 minutes, until the edges are set and the coconut is lightly toasted. The center will still look a little soft; it firms as it cools.
Cool and chill. Cool completely in the pan, then refrigerate at least 4 hours (overnight is best) before lifting out with the parchment and cutting into 24 bars. Wipe the knife between cuts.