Here is a recipe with the corn syrup http://cookeatshare.com/recipes/mounds-chocolate-candies-10015
I have made mounds with the following ingredients and I swear they taste just like the candy.
2/3 cup sweetened condensed milk, 1 tsp. vanilla, 2 cups powdered sugar, 12-14 oz. bag of coconut. Mix milk and vanilla, add sugar 1/2 cup at a time, mix until smooth. Add coconut and spread in a parchment lined pan (I spray my parchment) chill until firm, cut into squares, logs or whatever shape you want, dip in my favorite...DARK CHOCOLATE or milk chocolate.