Preheat oven to 350°F.
Make sure pie crust is completely defrosted if it was frozen. Using a 4-inch cookie cutter, cut out circles.
Using a rolling pin, roll each small pie crust out to ~5 inches in diameter. Or, use fingers/palms to press and flatten dough. This is to slightly thin out dough and to fit the dough into muffin tin.
Insert small pie crusts into muffin cups. Fold the sides of the crusts and fit crusts into each muffin cup .
Bring unsalted butter and dark chocolate to a bowl. Melt unsalted butter and dark chocolate together by microwaving them at 50% power at 30 seconds intervals. Every 30 seconds, bring bowl out and stir - repeat until all the chocolate is melted. Do not short cut this to avoid burning chocolate.
Add evaporated milk, vanilla extract, and egg. If mixture is too warm, wait to let it cool before adding eggs (to avoid making scramble eggs! :) )
Mix dry ingredients together - sugar, flour, unsweetened cocoa powder
Combine dry ingredients into wet ingredients. Mix well
Add filling into each muffin cup.
Bake for 25 minutes. Let it cool for 15 minutes. Remove pies.
Serve with whipped cream and enjoy!