Preheat your oven to 350 F / 180 C and line a mini-muffin tin with paper. Add the almond flour, cocoa powder, baking powder, and salt to a medium-sized bowl. Whisk until no lumps remain and set aside.
In a large bowl, add the room temperature butter, cream cheese, ½ tsp vanilla, and granulated erythritol. Beat using a hand blender or stand mixer until combined. Add the eggs and continue to mix.
Add the dry ingredients to the wet. Fold the mixture using a spatula until incorporated. Do not overmix.
Divide the batter into the tin holes using a cookie scooper. Bake for 12-15 minutes or until an inserted toothpick comes out clean. Let them cool completely before handling.
To prepare the Keto buttercream frosting, add ½ cup of butter to a bowl. Beat using a hand mixer until softened. Add the powdered erythritol gradually and beat until creamy. Add ½ tsp vanilla extract and mix one last time then transfer to a piping bag.
Transfer the buttercream to a piping bag with a round attachment. Pipe a ring the size of the cupcake top. Pipe another ring slightly smaller than the first, then finish it with one piping in the middle.
Add 2 chocolate chips to the top of the frosting to represent the eyes. Transfer the cupcakes to the fridge to set. Serve cold.