Pre-heat oven to 350 degrees F (approx 176 degrees C).
Mix together cinnamon, chipotle pepper, salt and cornstarch with a fork, this is an important step, make sure they are mixed together well, so you don't end up with "pockets" of pure pepper in the pie. Set aside.
Combine chocolate, cream, milk and butter in a heat-resistant glass bowl large enough to fit on top of a heavy bottomed pot. Pour a cup of water in the pot and bring to a boil over high heat. Reduce temperature and place heat-resistant glass bowl with chocolate mixture over the pot to create a double boiler. Whisk constantly until chocolate is melted.
Pour chocolate mixture into another glass bowl and let it cool down for 3 minutes.
Fold in dry ingredients. Add eggs and whisk until combined. You will end with a silky liquid.
Pour mixture into the frozen Marie Callender's Pastry Pie Shell and bake for 35-40 minutes, or until a toothpick inserted into the middle comes out cleanly.