01 -
Preheat oven to 350°F. Spread the oyster crackers in a single layer on a parchment-lined baking sheet.
02 -
Melt the butter in a medium saucepan over medium heat. Stir in the brown sugar, vanilla, and cinnamon. Bring to a gentle boil and cook for 2 to 3 minutes, stirring constantly, until the mixture thickens and turns a shade darker than maple syrup.
03 -
Pour the hot caramel over the crackers. Toss gently with a greased spatula to coat evenly. Sprinkle the flaky salt over the top.
04 -
Bake for 7 to 9 minutes, watching carefully, until the caramel is bubbly and slightly darker at the edges. Do not overbake.
05 -
Let the tray cool completely at room temperature, about 30 minutes, until the caramel hardens. Break into clusters and serve.