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For the caramel sauce: in a medium size sauce pan, combine the sugar and the water and stir to combine. Wipe down the sides of the pan with a wet pastry brush to remove any sugar crystals. After this do not stir any more. Cook over medium-high heat until golden amber in color. Swirl the pan occasionally to make sure mixture is cooking evenly. Once color is golden amber remove from heat.
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Carefully whisk in the cream. Mixture will bubble furiously and act quite crazy. This is why you want to start with a fairly large pot. Whisk in the butter, then the Biscoff, until smooth and creamy. Stir in vanilla. Allow to cool while preparing the rest of the recipe.
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For the blondie cookie crust, preheat oven to 375F˚. Spray 4 (12 cup) mini muffin pans with baking spray.
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In an electric mixer, cream together the butter, granulated sugar, brown sugar and Biscoff until fluffy. Beat in the egg, vanilla and milk. Add flour and baking soda and mix well.
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With a small scoop, place a rounded spoonful of batter into each muffin cup, filling about ½ to ⅔ full. Place in preheated oven and bake 12-15 minutes or until golden brown. Centers will sink slightly toward end of baking time. Remove from oven, if center has not sunk in, make a small indention with the back of a spoon.
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Allow to cool for about 30 minutes in the pan, then remove from pan and place on a plate or a tray. Fill the centers of each* with the caramel sauce. Allow caramel to settle for about 15 minutes, then sprinkle lightly with sea salt. Refrigerate for at least 3-4 hours. Remove from refrigerator 20-30 minutes before serving.