Preheat your oven to 350°F (175°C). Line a large baking sheet with parchment paper to prevent sticking and ensure easy cleanup.
In a medium saucepan, combine the packed brown sugar, butter pieces, light corn syrup, and pure vanilla extract. Place the saucepan over medium heat. Stir the mixture frequently until it reaches a rolling boil.
Once boiling, allow the mixture to cook undisturbed for approximately 5 minutes. You want it to thicken slightly, creating a smooth caramel consistency.
Carefully remove the saucepan from the heat. Quickly add the baking soda and stir to incorporate. The caramel will bubble and foam, so be cautious.
In a large mixing bowl, place the oyster crackers. Pour the warm caramel sauce over the crackers, using a spatula to gently fold and coat each cracker evenly.
If desired, incorporate the chopped pecans or walnuts into the mixture for an extra layer of flavor and crunch.
Transfer the coated oyster crackers onto the prepared baking sheet, spreading them into a single, even layer to promote even baking.
Bake the crackers in the preheated oven for 8-10 minutes. Stir the mixture halfway through the baking time to ensure even caramelization. The crackers should be golden, and the caramel should be bubbling.
Once baked, take them out of the oven and immediately sprinkle the flaky sea salt over the hot caramel-covered crackers for that perfect salty-sweet balance.
Allow the bites to cool on the baking sheet completely. Once cool, break them into delightful clusters that can be easily enjoyed.
Notes
Serve in a decorative bowl or jar and drizzle with additional warm caramel for extra indulgence.