Preheat your oven to 400°F (204°C) and line a baking sheet with parchment paper.

Arrange the saltine crackers in a single layer on the prepared baking sheet.

Melt the butter and brown sugar together in a saucepan over medium heat, stirring continuously until it boils.

Pour the toffee mixture quickly over the crackers, spreading it evenly. Bake for 5-7 minutes until bubbly and golden.

Sprinkle the semi-sweet chocolate chips over the hot toffee immediately after baking.

Combine the granulated sugar and cinnamon, then sprinkle over the melted chocolate.

Finish with a sprinkle of sea salt over the top.

Cool the toffee completely before breaking it into pieces.