If when you remove the toothpick it does not come out clean, place the cupcakes back in the oven for a short while to finish baking. Be sure to watch your cupcakes closely after this to ensure they do not burn.
Explanation
A fork would also be a suitable object for this task as well.
You should allow cupcakes to cool completely before adding icing or frosting.
The frosting will likely melt if it is applied to a warm/hot cupcake. Frosting cooled cupcakes helps the frosting to maintain its intended shape.
The entire egg is used in most all cupcake recipies.
This allows the cupcake batter to expand during baking and ensures the cupcakes will be a perfect size.
Adding milk makes the mixture more loose.
Although carrots are technically a wet ingredient, they are added at a later time to ensure an even mixture/consistency is achieved when combining ingredients.
Sorry, salt is added to the dry ingredients!