Heat milk, heavy cream and sugar to medium sauce pan. Stir in chocolate chips until completely melted.
Add 3 tbsp of water to gelatin and let sit until thickens. Add slurry and gelatin to chocolate mixture. Whisk until fully incorporated and let cool.
In a bowl, whisk eggs and slowly pour 1-2 cups of cooled chocolate mixture into eggs. Be sure not to curdle the eggs. Then add that to the large chocolate mixture. Whisk over medium heat until thickens, about 3-5 minutes.
Pour chocolate mixture in pie crust and let sit in fridge 8 hours or overnight.