Preheat the oven to 400 degrees Fahrenheit. Lay the Craize crackers in a single even layer on a parchment lined medium baking sheet – It’s okay if some of the crackers are broken.
Add the butter and sugar to a small saucepan over medium heat. Let the butter melt and bring to a simmer, stirring constantly. Allow to bubble and simmer for 3-5 minutes, stirring often. Immediately pour the sugar mixture over the Craize. Transfer to the oven and bake for 5 minutes.
Remove from the oven and top with the chopped chocolate. Return to the oven for about 3 minutes or until the chocolate is melted.
Top with the chopped pecans and a generous pinch of flaky salt. Let cool to room temperature, then transfer to the refrigerator to chill completely.