Espresso Caramel Bars

INGREDIENTS

• 1 teaspoon smoked sea salt, optional
• 1 1/2 sticks (6 ounces) unsalted butter, melted
• Vegetable cooking spray
• 12 whole (6 ounces) cinnamon graham crackers, crumbled or 2 cups cinnamon graham cracker crumbs
• 1/2 cup heavy cream
• 1/4 cup sugar
• 1 1/2 cups light brown sugar
• 1 stick (4 ounces) unsalted butter, at room temperature
• 2 cups (12 ounces) semisweet chocolate chips
• 1 3/4 teaspoons instant espresso powder
• 1 tablespoon water