Add in all wet ingredients and whisk together. Then using a rubber spatula, scrap down the sides and bottom of the bowl to make sure no dry flour remains and whisk again, vigorously for another minute or two until smooth.
2 large eggs, 1/2 cup buttermilk**, 1/2 cup warm water, 2 Tbsp vegetable oil, 1 tsp vanilla extract
Fill each liner 2/3's full and bake for about 15-18 minutes or until a toothpick inserted in the center comes out clean.
To make the buttercream:
Using a handheld mixer or stand mixer with a paddle attachment, beat butter until light and fluffy.
1 cup unsalted butter
Add 2 tbsp of cream, extract, and 1 cup of icing sugar. Beat well and add remaining cups of icing sugar, one at a time. Beat well after each addition. Add another tbsp of cream if needed to get desired consistency.
4 cups icing sugar, 2-3 Tbsp cream or milk, 1-2 tsp mint or peppermint extract
Add the green food coloring, a few drops at a time until you get your desired color (I used 10 drops)
Stir in chocolate chips, frost on top of completely cooled cupcakes.
1/2 cup mini chocolate chips
Notes
If you want to pipe your frosting, make sure you use a large enough tip like a Wilton 8B or 1A**You can store the rest of the buttermilk in the freezer in small plastic containers and when ready to use for another recipe, simply thaw and stir. Alternatively, you can make your own buttermilk by adding 1 tbsp of white vinegar to a liquid measuring cup, then add enough milk (1% or higher) to make one cup. Let stand for 5 minutes.