Preheat your oven to 400°F (200°C).

Line a baking sheet with parchment paper.

In a saucepan over medium heat, melt the butter and add the brown sugar. Stir continuously until the mixture comes to a boil, and let it boil for 3 minutes.

Add the vanilla extract to the bubbling mixture.

Pour the toffee mixture over a layer of saltine crackers arranged in a single layer on the baking sheet.

Bake for 5-7 minutes until the toffee is bubbly and golden.

Remove the baking sheet from the oven and sprinkle the chocolate chips on top. Let them sit for a few minutes until melted, then spread the chocolate evenly.

Sprinkle the chopped nuts over the melted chocolate and press them gently into the chocolate.

Let the candy cool completely before breaking it into pieces.