for 25–30 minutes, or until the top is lightly browned, the edges are set, and a toothpick inserted near the center comes out mostly clean (a few moist crumbs are fine).
Remove the dish from the oven and place it on a speckled granite or heat-safe countertop to cool. Let the bars cool for at least 20–30 minutes so the soft center can set and you can slice clean squares.
Once mostly cooled but still slightly warm, cut into 12–16 bars and serve directly from the clear glass casserole dish.
