Place a wire rack over a parchment-lined baking sheet.

Place the white chocolate in a heatproof bowl, and place the bowl over a small saucepan filled with simmering water. Stir constantly until the chocolate is completely melted.

Dunk an Oreo into the white chocolate and use a fork to scoop out the Oreo. Place on the wire rack and gently shake the rack to remove excess chocolate as needed. Allow to dry.

Repeat with the remaining Oreos. Occasionally, you will gently need to move the Oreos on the wire rack so they don't get stuck to the wire rack,

As you get to the last of the white chocolate, take the chocolate that dripped down onto the parchment paper and place back in the bowl with the melted white chocolate to remelt and use.

Once the Oreos are dried, make the topping.

Mix together the powdered sugar and cinnamon. Slowly add the water, stirring very well until the mixture becomes a thick paste.

Place the paste into a sandwich bag and clip a small bit of one of the corners. Pipe swirls on the tops of the Oreos. Allow to dry.