1. Preheat your oven to 350°F (175°C) and line a rimmed baking sheet with parchment paper or a silicone baking mat. This will keep the toffee from sticking and make cleanup a breeze.
2. Arrange the saltine crackers in a single, tight layer on the baking sheet, covering the entire surface without overlapping. This salty base is the backbone of the recipe, so take a moment to get them snug.
3. In a medium saucepan, melt the butter over medium heat. Once melted, add the brown sugar and stir well to combine.
4. Bring the mixture to a gentle boil, stirring constantly. Let it cook for 3-4 minutes until it thickens slightly and becomes glossy. You’ll know it’s ready when the sugar is fully dissolved and the caramel coats the back of your spoon.
5. Immediately pour the hot caramel evenly over the arranged saltines. Use a spatula to spread it gently but thoroughly, making sure all crackers are coated.
6. Place the baking sheet in the oven and bake for 5-7 minutes. You want the caramel to bubble and set, so keep an eye on it to avoid burning.
7. Remove the tray from the oven and, while still warm, sprinkle the cinnamon and granulated sugar mixture evenly over the top. For an extra touch, add a pinch of kosher salt to balance the sweetness.
8. Let the toffee cool completely on the counter until firm—this can take about 2 hours. For faster results, you can chill it in the refrigerator, but I like to let it set naturally to preserve that buttery mouthfeel.
9. Once set, break the toffee into bite-sized pieces. Store in an airtight container at room temperature for up to a week, or freeze for longer storage.

From my own kitchen adventures, I’ve learned that timing is everything here. When I first tried this recipe, I rushed the cooling process and ended up with sticky, uneven pieces. Letting it cool fully at room temperature makes all the difference in getting that satisfying crunch and perfect bite.