Place the milk chocolate in a microwave safe bowl and heat in 30 second intervals, stirring in between each heating, until melted. Pour the chocolate into the prepared pan.
Heat the orange candy melts in another microwave safe dish in 30 second intervals, stirring in between each heating, until melted.
Place dollops of orange candy on top of the milk chocolate. Take a butter knife and swirl the colors together.
Quickly place the candy corn and Halloween candy on top of the chocolate and sprinkle with Halloween sprinkles.