Start by dividing the prepared vanilla pudding into three separate bowls. Add a few drops of orange food coloring to one bowl, yellow food coloring to another, and leave the third bowl white. Whisk each gently until the colors are evenly incorporated and the pudding is smooth.
Pour a layer of the white vanilla pudding into the bottom of each glass or jar, filling about a third of the way up. This forms the first segment of the layered effect.
Carefully spoon the orange-colored pudding over the white layer, aiming to create a distinct, even band about a third of the glass height. Gently tap the glass on the counter to level the layer if needed.
Next, add a layer of yellow pudding on top of the orange, filling the glass another third. Keep the layers neat for a visual candy corn effect.
Sprinkle a generous layer of crushed sugar cookies over the top of the yellow pudding to add a crunchy texture and resemble the candy's crisp exterior.
Repeat the layering process: starting with white pudding, then orange, then yellow, until each glass is filled and visually resembles the candy corn's color blocks.
Finish with a final sprinkle of cookie crumbs on top for a crunchy finish and decorative appeal.
Place the parfaits in the fridge for at least 15 minutes to set slightly and allow flavors to meld. Serve chilled for a festive Halloween treat.