Preheat the oven to 420F.
Combine dry ingredients in a large bowl and set aside.
Mix wet ingredients in a separate bowl and combine with dry ingredients.
Fold in dark chocolate chunks and milk chocolate chips.
Let batter rest for 30 minutes to an hour before baking.
Prepare fudge filling by cooking and cooling the ingredients.
Fill the muffins with the fudge filling once cooled.
Store leftovers in the freezer for up to 3 months.
Thaw the muffins for an hour and a half before serving.
