Preheat your oven to 250°F (120°C). Line a large baking sheet with parchment paper or foil.

In a medium saucepan, combine butter and brown sugar over medium heat. Stir continuously for about 2-3 minutes until it bubbles and thickens.

Remove from heat, stir in vanilla extract and sprinkle baking soda, watch for foaming action.

Pour the warm caramel over the oyster crackers in a large bowl; mix gently until evenly coated.

Spread coated crackers onto the prepared baking sheet in an even layer and bake for about 45 minutes, stirring every 15 minutes.

Let cool completely on the baking sheet, then break apart any clumps and enjoy!