Spooky Homemade Twix Bars

Bahan-bahan (16 porsi)

• 1/4 cup dark brown sugar
• 1 stick (1/2 cup) salted butter, at room temperature
• 2 teaspoons vanilla extract
• 1 egg
• 1 1/4 cups all-purpose flour
• 6 tablespoons salted butter
• 1 cup dark brown sugar, packed
• 1/2 cup apple cider
• 1 teaspoon flaky salt
• 12 ounces dark chocolate, chopped
• 1 tablespoon coconut oil
• candy eyeballs