Caramel Pecan Bars with Chocolate Drizzle

Bahan-bahan (16 porsi)

• 3 tablespoons butter, (at room temperature)
• ⅓ cup packed dark brown sugar
• ½ teaspoon vanilla extract
• ¾ cup all purpose flour
• 30 invidual soft caramels, (unwrapped)
• 1 tablespoon skim milk
• ¼ cup pecans, (sliced in half lengthwise)
• 1 ounce chopped dark chocolate
• 1 ounce chopped white chocolate