Bake the trays on the middle rack of your oven for the time recommended on the brownie mix box, usually 20–30 minutes. Start checking a few minutes early; you want the edges set and a toothpick inserted into the brownie (not a caramel pocket) to come out with a few moist crumbs but not wet batter.
Remove the trays from the oven and let them cool on a wire rack. The caramel and topping will firm up as they cool, which makes them much easier to slice. If you want cleaner squares, let them cool completely or even chill them briefly in the fridge.
Once cooled, slice into small squares or rectangles right in the tin foil trays. Serve straight from the pans for a casual family dessert, or lift out pieces to arrange on a platter if you’re taking them to a gathering.
Variations & Tips
For picky eaters, you can keep things extra simple by using plain crisp rice cereal as the crunchy topping and skipping any mix-ins that might scare them off—just brownies, caramel, cereal, and chocolate chips. If your crew loves nuts, stir 1/2–1 cup of chopped pecans or walnuts into the crunchy topping for a more grown-up flavor and extra texture. For a salty-sweet twist, use crushed pretzels as the crunch layer and sprinkle a tiny pinch of flaky sea salt over the top right when the pans come out of the oven. If you need to save a little time, you can swap the caramels and cream for a thick store-bought caramel sauce—just drizzle it generously over the batter before adding the crunch topping. To make these feel a bit lighter for summer, bake them slightly under so they stay fudgy, then chill and serve small squares with a big scoop of vanilla frozen yogurt and fresh berries. These trays also freeze well: cool completely, cover tightly with foil and plastic wrap, and freeze for up to a month; just thaw in the fridge overnight before serving.
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