Matzo Brittle, for Passover (and Easter, Too)

Ingredients

• 3 sheets of unsalted matzo
• 1 stick of unsalted butter
• 1/2 cup of brown sugar
• 1/2 cup of slivered or sliced almonds
• 1/2 teaspoon of fleur de sel, plus gray sea salt for finishing
• 1 cup of semi-sweet chocolate chips
• 1/2 teaspoon of vanilla extract