Mint Chocolate Chip Layer Cake

+ 1 TBSP unsweetened cocoa powder

cake flour ((1 1/2 cups))

salt

baking soda

unsalted butter (at room temperature)

granulated sugar ((1 1/2 cups))

large eggs (at room temperature)

water (at room temperature)

whole milk (at room temperature)

miniature chocolate chips ((1 cup))

Andes mints (chopped, plus additional for decorating)

dark chocolate

egg whites (at room temperature)

granulated sugar ((2 cups))

butter (at room temperature)

peppermint extract

Green gel food coloring

heavy cream

semi-sweet chocolate ((about 1/2 cup), finely chopped)