Chocolate Caramel Toffee Crackers

to 6 sheets matzo* or approximately 40 Saltine crackers or crackers of your choice

or 8 ounces) unsalted butter, cut into a few large pieces

packed brown sugar

big pinch of sea salt

vanilla extract

semi- or bittersweet chocolate chips (or chopped bittersweet or semisweet chocolate)

toasted chopped almonds, pecans, walnuts or a nut of your choice (optional)

Extra sea salt for sprinkling (optional)

parchment paper and foil

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*I bought a box of hexagonal matzo crackers by accident. It still worked after I jigsawed them together in the bottom of my pan, breaking some in half to fill in the gaps along the edge.