Lightly spray an 8-inch square pan with vegetable oil, set aside
Place the white chocolate chips and milk in a microwavable safe bowl, place in microwave on High 1 - 2 minutes, or until chocolate is almost melted; stir until completely melted. You can use a double boiler if you prefer.
In prepared pan, spread half the white chocolate mixture into the bottom of the pan; sprinkle with 1/2 of the chocolate chips and 1/2 of the candy corn.
Immediately top with remaining white chocolate mixture, spreading evenly.
Top with the remaining chocolate chips and candy corn.
Refrigerate for 2 hours or until firm.
Flip over onto wax paper and cut into 1 inch squares.
Store in an airtight container in refrigerator for up to 3 weeks (do not freeze).