Preheat your oven to 400°F (200°C). Line a baking sheet with aluminum foil and arrange the saltine crackers in a single layer, covering the entire sheet.
In a medium saucepan over medium heat, melt the butter. Once melted, stir in the brown sugar, vanilla extract, ground cinnamon, and salt. Bring the mixture to a boil, stirring constantly for about 3 minutes until it thickens slightly.
Pour the caramel mixture evenly over the saltine crackers, spreading it gently to cover all the crackers.
Bake in the preheated oven for 5-7 minutes, until the toffee is bubbly and golden. Remove from the oven and let it cool for 5 minutes.
Sprinkle the chocolate chips over the hot toffee. Allow them to sit for a couple of minutes to soften, then spread the melted chocolate evenly over the surface.
In a small bowl, mix the powdered sugar and ground cinnamon together. Sprinkle this mixture over the chocolate layer.
Let the toffee cool completely at room temperature, or for quicker results, refrigerate for about 30 minutes until set.
Once cooled, break into pieces and serve.