In a large bowl, pour both packages of instant vanilla pudding mix and add the milk. Then mix according to package instructions. This will make 6 cups of pudding.
Divide the pudding so there are 2 cups of pudding in one bowl and 4 cups of pudding in another.
In the bowl with the 4 cups of pudding, add 5 drops of orange food coloring, mixing between each drop until desired orange color is achieved. No need to color the pudding in the other bowl.
Then in a plastic cup, add 4 spoonfuls of the yellow vanilla pudding for the bottom layer. Then 8 spoonfuls of the orange-colored vanilla pudding for the second layer.
The pudding ratio should be about ⅓ yellow and ⅔ orange, with a little extra room for the cool whip on top.
Next, cover the top with the thawed cool whip.
Finally, add candy corn and sanding sugar on top of the cool whip.
Serve chilled or at room temperature.
Store any leftover pudding in an airtight container for 5-7 days.