1-First Step: Prep and mise en place Preheat the oven to 400 degrees Fahrenheit. Line a rimmed baking sheet with parchment paper or foil. Use a baking sheet with at least a 1/2 inch edge to catch any bubbling caramel. Arrange approximately 40 saltine crackers in a tight single layer across the sheet so there are no noticeable gaps. Laying the crackers before you heat the caramel saves time and prevents mishaps once the caramel is ready.

2-Second Step: Make the caramel In a medium saucepan combine 1 cup butter and 1 cup brown sugar. Set the pan over medium heat and stir until the sugar dissolves and the mixture comes to a boil. Once boiling, keep it boiling for exactly 3 minutes. Stir carefully at first to mix, then let it reach a steady boil and set a timer for 3 minutes. The caramel should reach a deep golden color but not burn. Boiling for too short a time prevents setting; boiling too long can make the candy hard.

3-Third Step: Pour caramel over crackers Immediately pour the hot caramel evenly over the arranged crackers and spread with a spatula to cover them. Some caramel may pool; that is okay. Place the sheet in the oven and bake for 5 to 6 minutes, until the caramel is bubbly and the crackers appear to be floating in the mixture. The oven step helps the caramel set into the crackers and gives the toffee its signature chew.

4-Fourth Step: Chocolate topping Remove the pan from the oven and check the crack placement; nudge any misaligned crackers back into place with a spatula. Sprinkle 2 cups chocolate chips evenly over the hot caramel. Let them sit for a couple of minutes to soften and melt from the heat of the caramel. If the pan cools too much before the chips melt, return briefly to the oven for a minute or two or microwave chips in short bursts and spread immediately. For faster melting, use mini chocolate chips.

5-Fifth Step: Spread and finish Once the chips have softened, use a spatula to spread them into a smooth, even layer. Sprinkle 3/4 cup chopped nuts and a light pinch of sea salt if desired. Press toppings lightly into the chocolate so they adhere. The sea salt is optional, but it lifts the flavor and contributes to the addictive sweet-salty profile.

6-Final Step: Cool, set, and serve Allow the toffee to cool completely at room temperature. For faster setting, refrigerate briefly until the chocolate has firmed. Break into pieces with your hands or cut into squares. Store in an airtight container or freeze for longer life. Yield is about 24 servings depending on the piece size.