Mix the powdered sugar, sweetened condensed milk, and almond extract thoroughly with a fork.
Add a few tablespoons of milk as needed to make the icing runny enough to move when you tilt the cookie, but not so thin that it will fall off the cookie. The half that you pull to the side to cover the cookie first in white icing can be a bit runnier than your colored icing.
Keep half of the icing white, and then split the other half into 4 separate cups.
Each cup will be dyed a different color with food coloring. We used the “neon” box and used all 4 colors provided and we used quite a bit of food coloring for each color.
Take a large measuring cup and layer your different colors of painted icing in the cup together.
You are ready to pour the icing on your cookie. Set up your cookie on a rack with a trash bag or something else under it to protect your surface.
You want to first pour paint the cookie white with your thinner icing. This is because if you miss any places with the colorful icing, they won’t be icingless, but ALSO because the colorful icing itself is going to move a lot easier on an already wet surface.
Now it’s time to pour your big cup of crazy icing swirls in the middle of the cake!
Start carefully lifting your rack to tilt the icing in different directions, but make sure the cookie doesn’t slide off the rack.
You can use the little bits that are still in the cup to add splashes of color where you want them.
When you have the icing flowing over all the edges of the cookie, place it flat. Within a few minutes the icing will all lay itself flat and even out.
Cover the cookie in ridiculous assorted sprinkles while the icing is still wet.
All the icing to dry and harden. Then cut and serve your cookie.