01 -
Preheat oven to 350°F (175°C). Line a 9x13-inch baking pan with parchment paper.
02 -
In a large bowl, mix together the chocolate cake mix, melted butter, and 1 egg until well combined.
03 -
Press the mixture evenly into the prepared baking pan to form the crust.
04 -
In another bowl, beat cream cheese and sugar until smooth. Add 2 eggs and vanilla extract, mixing well.
05 -
Fold in the sour cream until just combined.
06 -
Pour the cheesecake mixture over the crust.
07 -
Sprinkle M&M's and chocolate chips evenly over the top.
08 -
Add Halloween sprinkles for decoration.
09 -
Bake for 35-40 minutes, or until the center is almost set.
10 -
Allow to cool completely, then refrigerate for at least 2 hours before cutting into bars.