• Preheat oven to 350 degrees.
• Whisk together the flour, sugar, cocoa, baking soda, and salt in a large bowl.
• In the bowl of a stand mixer or in a large bowl with a hand mixer, combine the buttermilk, oil, eggs, apple cider vinegar, vanilla, and food coloring.
• Mix the dry ingredients into the wet ingredients gently until just combined, taking care not to over-mix.
• Put papers into a cupcake tin and fill papers ¾ of the way full. Bake for about 20-22 minutes, until cupcakes are cooked through and springy to the touch. Let cool in the pan for a few minutes before moving to a wire rack to cool completely.
• Once cooled, remove the center of each cupcake using a cupcake corer or knife. Fill middles of cupcakes with marshmallow fluff.
• Drizzle chocolate ganache over the top and then place a Valentine's Day Peep on top.

Marshmallow Fluff

• In the bowl of a stand mixer or in a large bowl with a hand mixer, beat together egg white, corn syrup, and salt on high speed for about 4-5 minutes until it thickens up and turns white.
• Mix in the powdered sugar, vanilla, and cream of tartar on low speed, until combined.
• Place marshmallow fluff in the fridge until ready to use.

Chocolate Ganache

•  Place the cream in a saucepan over medium heat and bring to a simmer. Put chocolate in a heat-proof bowl.
• Pour the cream over the chocolate and let stand for a few minutes. Then, stir together to make certain chocolate is melted. Use immediately.