If you’re making more than one color of frosting from one batch, divide the frosting into separate bowls - one for each color of frosting.
For light or pastel colors, dip a toothpick in the gel food coloring and add to the frosting (make sure you use a new toothpick every time you add more so you don’t contaminate your food coloring).
For dark colors add one to two drops of food coloring per batch of frosting. Remember, you can always add more coloring but you can not take it away once it's been added.
Using a spatula, or your electric mixer, mix the food coloring into the frosting. If necessary, add more food coloring and remix, keeping in mind the color will develop and darken slightly as it sits.
If you’re looking to get a super dark or vibrant color of frosting there is no need to dump a whole container of food dye into your buttercream! Instead, use an immersion blender in the bowl of frosting and it immediately will darken and become more vibrant.
Use on your favorite desserts and enjoy!