Follow these detailed steps carefully to ensure your No-Bake Salted Caramel Bars turn out perfectly every single time. The process is straightforward, but precision, especially with the caramel, is key.

Step 1: Prepare the Pan and the Crust

1. First, prepare your baking pan. Take a 9×13 inch baking pan and line it with parchment paper, leaving a 2-inch overhang on the two long sides. This overhang will act as “handles,” making it incredibly easy to lift the entire slab of bars out of the pan for cutting later. Lightly grease the parchment paper and any exposed parts of the pan with butter or non-stick spray to guarantee nothing sticks.
2. If you’re starting with whole rolled oats, place them in a food processor or a high-powered blender. Pulse them 10-15 times until they are coarsely ground. You’re not looking for a fine flour; you want some texture to remain, with some larger pieces of oats still visible. This texture is what gives the crust its signature chewiness. If you don’t have a food processor, you can use the oats whole for a chewier, more rustic crust.
3. In a large mixing bowl, combine the ground oats and the packed light brown sugar. Whisk them together to ensure the sugar is evenly distributed.
4. Pour the melted unsalted butter over the oat and sugar mixture. Using a spatula or a wooden spoon, stir everything together until the mixture is thoroughly moistened and resembles wet sand. Every oat flake should be coated in butter.
5. Transfer this mixture to your prepared 9×13 inch pan. Dump it into the center and use your spatula to spread it out into an even layer. Then, using the bottom of a flat measuring cup or the palm of your hand, press the mixture down firmly and evenly across the entire bottom of the pan. This is a crucial step – a firmly packed crust will be a stable base that won’t crumble when you cut the bars.
6. Place the pan with the crust into the refrigerator to chill and set while you prepare the caramel filling. Chilling for at least 15-20 minutes is ideal.

Step 2: Cook the Salted Caramel

1. In a medium to large heavy-bottomed saucepan (a heavy bottom is important to prevent scorching), combine the 1 cup of unsalted butter pieces, 1 cup of packed light brown sugar, light corn syrup, and the can of sweetened condensed milk.
2. Place the saucepan over medium heat. Stir the mixture constantly with a heat-resistant spatula or wooden spoon, making sure to scrape the bottom and corners of the pan to prevent the sugar from sticking and burning.
3. Continue stirring as the butter melts and the sugar dissolves. The mixture will begin to bubble. Once it reaches a steady, rolling boil, you need to be precise. Reduce the heat slightly to medium-low to maintain a constant, but not violent, boil.
4. Boil the mixture, stirring continuously, for 5 to 7 minutes. This is the most critical part of the recipe. Boiling develops the color and, more importantly, cooks the sugar to the “soft ball” stage, which ensures the caramel will set properly once cooled. If you have a candy thermometer, you’re looking for a temperature between 235°F and 240°F (112°C to 115°C). If you don’t have a thermometer, watch the color and consistency. The caramel should thicken noticeably and turn a deep, beautiful amber color.
5. Once the caramel has boiled for the correct amount of time or reached the target temperature, immediately remove it from the heat.
6. Carefully stir in the pure vanilla extract and the 1 teaspoon of fine sea salt. Be cautious, as the mixture may bubble up when you add the vanilla. Stir until the salt is fully dissolved and everything is well combined.

Step 3: Assemble and Chill

1. Remove the pan with the chilled crust from the refrigerator. Immediately and carefully pour the hot caramel mixture over the crust.
2. Use an offset spatula or the back of a spoon to quickly spread the caramel into a smooth, even layer, making sure it reaches all the corners.
3. Place the pan back into the refrigerator and let it chill uncovered for at least 45 minutes to an hour. The caramel needs to be cool to the touch and partially set before you add the chocolate layer. If the caramel is too warm, the chocolate will not layer properly.

Step 4: Add the Chocolate Topping and Final Chill

1. Once the caramel layer is cool and firm, prepare the chocolate topping. Place the semi-sweet chocolate chips and the optional tablespoon of coconut oil or shortening into a microwave-safe bowl.
2. Microwave in 30-second intervals, stirring well after each interval, until the chocolate is almost completely melted. Then, just stir until the residual heat melts the remaining chips and the mixture is perfectly smooth and glossy. This gentle heating method prevents the chocolate from seizing or burning. Alternatively, you can melt the chocolate in a double boiler over simmering water.
3. Pour the melted chocolate over the set caramel layer. Again, use your offset spatula to spread it into a thin, even layer that covers the entire surface.
4. Immediately, while the chocolate is still wet, sprinkle the top generously with the flaky sea salt. Don’t be shy! This final salty crunch is what makes these bars so addictive.
5. Return the pan to the refrigerator one last time. Let it chill for at least 2 hours, or until the chocolate is completely firm and the entire bar is set. For best results and the cleanest cuts, chilling for 4 hours or even overnight is recommended.

Step 5: Cut and Serve

1. Once fully chilled and set, remove the pan from the refrigerator. Let it sit at room temperature for 10-15 minutes. This slightly softens the chocolate, preventing it from cracking and shattering when you cut into it.
2. Grasp the parchment paper “handles” and carefully lift the entire slab of bars out of the pan and onto a cutting board.
3. Use a large, sharp chef’s knife to cut the bars. For the cleanest cuts, run the knife under hot water and wipe it dry between each cut. This will melt the chocolate just enough to slice through it cleanly. You can cut them into 24 medium squares or 36 smaller, bite-sized bars.