Bar Twix buatan sendiri

Bahan-bahan (12 porsi)

• 1 cup salted butter (2 sticks, at room temperature)
• 1 cup gula manisan
• 2 teaspoons ekstrak vanila
• 2 cups All-Purpose Flour
• 2 cups caramel (cut into small chunks (about 14 oz))
• 3 tablespoons krim kental
• 2 cups milk chocolate (chopped, melted)
• 1 tablespoon vegetable shortening (optional)