Combine sugar, 2 Tablespoons of milk, corn syrup, and vanilla extract (and/or almond extract) in a medium-sized bowl and stir until combined. Add in more milk If frosting is too thick, starting with a teaspoon at a time. You want the icing to be thick enough to put in your frosting bag, but thin enough to spread over cookies. If you accidentally add too much milk, add powdered sugar until desired texture is reached. Unlike baking where measurement precision matters, you can gradually add things in with this recipe.
If you are coloring the icing, divide into bowls and dye. You can use gel food coloring or more traditional colors. Remember, a drop or two might be all you need!
OPTION 1: Transfer icing to a piping bag with a piping tip (like Wilton 5), or place in a Ziploc bag and snip a small piece of the corner off (this strategy works well if you do not have an icing bag). It's not as neat, but it gets the job done!
OPTION 2: If you're working with kids, give each one a plate to decorate and decorate with a knife or spreader.
OPTION 3: Dip the cookies into the bowl of icing. It's quick and easy if you have little hands that want to "help," and they can focus on adding sprinkles, etc. instead of decorating them with a knife.
Decorate cookies or pastry of choice with candy and sprinkles as desired while icing is still wet.
Allow time for icing to dry before eating. This could be several hours, so be patient!
Store finished cookies at room temperature in sealed container.