Place a trivet and 1 1/2 cups water inside of the instant pot.
Spray a (7-inch) cheesecake pan with cooking spray and line the base with a round of parchment paper.
In a medium bowl, stir together the brownie mix, canola oil, and 1 egg.
Set aside 1/4 cup of the brownie batter.
Pour the reamining brownie batter into the prepared springform pan.
In the bowl of an electric mixer, cream together the cream cheese and sugar, about 3 minutes. The batter should be smooth and creamy.
Beat in eggs, one at a time until combined.
Beat in the sour cream, flour, and vanilla until combined. Do not overmix.
Pour the cheesecake batter into the cheesecake pan
Pour the reserved brownie mix on top of the cheesecake and smooth it over the cheesecake batter with a butter knife.
Gently tap the cheesecake pan on the countertop to release any air bubbles. If any air bubbles rise to the surface, gently pop them with the time of a fork. Repeat until no more air bubbles pop up on the top.
Cover the cheesecake pan tightly with foil.
Carefully lower the cheesecake into the pressure cooker.
Close the lid and set the pressure release valve to sealing.
Press the manual or pressure cooker button and set to 35 minutes on high pressure.
Allow the pressure to naturally release.
Carefully remove the cheesecake from the instant pot and let cool on a cooling rack.
Once cooled to room temperature, refrigerate overnight or for atleast 8 hours.
Prepare the chocolate ganache once the cheesecake is fully chilled.
Heat the whipping cream in a small pot until lightly simmering.
Place the chocolate chips in a glass bowl and pour the hot cream over them. Let sit for 2 minutes.
Whisk together the chocolate chips and whipping cream until smooth and the chocolate is melted.
Spoon the ganache over the cheesecake and spread it evenly with a butter knife or angled spatula.
Place into the fridge to harden, at least 1 hour.
After chilling the cheesecake again, whip up the whipped cream.
Place the 1/2 cup whipping cream and powder sugar in the bowl of an electric mixer.
Whisk on high until stiff peaks form.
Dollop the whipped cream onto the cheesecake or use a piping bag for a more uniform look.
Sprinkle chocoalte chips over the whipped cream.
Serve and enjoy!