01 - Preheat your oven to 350°F (175°C). Line a rimmed baking sheet, approximately 10x15 inches, with parchment paper or aluminum foil. Arrange the saltine crackers in a single, even layer to completely cover the prepared baking sheet.
02 - In a medium saucepan, combine the unsalted butter and light brown sugar. Heat over medium heat, stirring constantly. Bring the mixture to a gentle boil and cook for precisely 3 minutes, stirring frequently, until it bubbles and begins to thicken slightly.
03 - Immediately pour the hot toffee mixture over the layer of saltine crackers on the baking sheet. Utilize a spatula to spread the toffee evenly, ensuring all crackers are coated.
04 - Place the baking sheet in the preheated oven and bake for 8–10 minutes, or until the toffee is bubbling and shows a slightly darkened hue.
05 - Remove the baking sheet from the oven. Promptly sprinkle the semi-sweet chocolate chips over the hot toffee. Allow the chips to sit undisturbed for 2 minutes to begin melting. Afterward, employ an offset spatula to spread the melted chocolate smoothly over the entire surface of the toffee.
06 - While the chocolate is still warm and pliable, evenly distribute the chopped dried cherries and flaky sea salt across the chocolate-covered surface.
07 - Permit the confection to cool at room temperature for 30 minutes. Subsequently, transfer the baking sheet to the refrigerator and allow it to set completely, which typically takes another 30 minutes.
08 - Once fully solidified, break or cut the crunch into desired pieces. Store the finished treat in an airtight container at room temperature for up to one week.