Cinnamon Walnut Dulce De Leche Bars

Ingredients

• 6 tablespoons unsalted butter
• 1 tablespoon honey
• 1/4 cup dark brown sugar, firmly packed
• one 14-ounce can sweetened condensed milk
• cinnamon
• kosher salt
• 1 1/8 cups unsalted butter (2 1/4 sticks, or 18 tablespoons), softened and divided
• 3/4 cup packed dark brown sugar, divided
• 2 tablespoons dark rum, divided
• 2 3/4 cups all-purpose flour, divided
• 1 teaspoon salt
• 2 teaspoons cinnamon, divided
• 1/2 cup walnuts, finely chopped