Line a baking sheet with aluminum foil and a sheet of parchment paper.
Arrange matzo pieces all over the pan in a single layer. This is a great way to use any broken pieces that you may have. You'll just want to minimize any gaps between the pieces. Set this aside for now.
In a sauce pan, combine the butter and brown sugar.
Cook this over medium heat, whisking continually until the mixture boils and becomes very thick toffee mixture. Remove it from the heat.
Pour the toffee over the matzo and spread it out with an offset spatula.
Bake the matzo for 10 minutes.
When the matzo comes out of the oven, immediately sprinkle the chocolate chips all over the top.
Wait 3 minutes and spread out the chocolate using an offset spatula again.
Sprinkle the chopped nuts and salt all over the top.
Allow the candy to cool to room temperature and then refrigerate for 45 minutes.
Cut the candy into pieces and store in an airtight container in a cool place or in the refrigerator.