This is honestly the best double chocolate cheesecake you will ever have. It is rich, creamy and decadent. I'm providing directions for baking in a conventional oven, but check the notes for how I did it in the pressure cooker if you feel like giving that a shot.
Use your favorite chocolate crumb crust. This recipe makes 1 6" x 3" cake and will serve 6-8 people. Feel free to double it to serve 16. In that case, you'll need a 9" x 3" springform pan for baking. No hard math for scaling--just double everything and it'll work out fine.
1 ½cupscookie crumbs(chocolate, preferably. If you don't have chocolate wafers or cookies, use graham crackers or vanilla wafers and add 1-1 1/2 Tablespoons cocoa powder)
melted butter, about 4 Tablespoons
For the Cheesecake Batter
1pound(2 8oz blocks) cream cheese at room temperature
5ozbrown sugar, sifted to remove any lumps (about 2/3 cup, sifted and firmly packed)
¼teaspoonfine sea salt
1teaspoonvanilla paste or extract
2large eggs at room temperature
1 ½teaspoonsinstant coffee dissolved in 1 1/2 teaspoons water or use 2 teaspoons coffee extract if you have some.
2ozsour cream, whipping cream or buttermilk at room temperature
½oz(2 Tablespoons) cocoa powder
6ozbittersweet chocolate, melted and cooled to just warm (I used 60% cacao chocolate chips)
For the Decoration
Feel free to do your own thing. If you want yours to look like mine, you'll need about 1/2-1 oz each dark chocolate, milk chocolate and white chocolate, melted.
Instructions
For the Crust
Spray a 6" x 3" springform pan with pan spray. Cut a parchment circle to fit in the bottom of the pan. If you don't have a leak-proof pan, wrap the bottom and sides of the pan tightly in a double layer of heavy duty aluminum foil.
Combine the cookie crumbs and the butter until the crumbs are evenly moistened but not greasy. They should hold together if you squeeze a bit.
Press them evenly across the bottom and maybe 1/2" up the sides of your prepared pan. You can bake it at 350F for 10 minutes, but I didn't this time and it worked out just fine and saved me 10 minutes of oven time. Your choice.
Set the pan aside.
For the Cheesecake Batter
Preheat the oven to 325F. Place a large cake pan or roasting pan on the center rack. It should be large enough to hold the 6" pan with about 2" clearance all around.
Put some water on to boil, maybe 2 quarts.
Cream the cream cheese on low speed until completely smooth, scraping the bowl as necessary.
Add the sugar, salt and vanilla and continue to cream on low speed until the batter is smooth. Scrape the bowl as necessary.
Add one egg and mix completely into the batter. Don't forget to scrape the bowl.
Add the other egg and mix completely. You're scraping the bowl, right?
Add your homemade coffee extract (the instant coffee dissolved in water). If you own coffee extract, use 2 teaspoons of that instead.
Whisk the sour cream and cocoa powder together thoroughly. It will look like it won't want to mix, but keep at it. What you end up with will look like chocolate whipped cream.
Add that mixture to the bowl and let it slowly incorporate. Scrape the bowl, people. All the way to the bottom.
Pour in the lovely melted and cooled chocolate and mix just until incorporate. Scrape the bowl and stir by hand to make sure all the batter is chocolatey and delicious.
Pour the batter into on top of the crust. It will come up to within about 1/2" of the top of the pan.
To Bake
Pull out the oven rack with the large pan on it.
Place the filled pan in the larger pan and then carefully pour the boiling water in the larger pan, allowing the water to come about halfway up the sides of the pan. A little less isn't a big deal, so don't sweat it too much.
Carefully push the rack back into position.
Bake until the center of the cheesecake reads 155F-160F on an instant read thermometer. If you don't have an instant read, bake until the edges of the cheesecake are firm but the center 2-3" is still a bit jiggly. I can't really give you a time for this, but I'd check it at 45 minutes and then go from there.
Once your cake has hit the magical temperature, carefully remove it from the hot water bath--leave that bath right where it is until it cools off--and place it on a wire rack. After about 10 minutes, run a thin knife or spatula around the inside of the pan to make sure the cake hasn't stuck anywhere. Allow to cool to room temperature, decorate as desired, and then chill until cold, at least 4 hours.
For the Decorations
Melt each chocolate in a separate little dish.
Using a spoon, fork, paintbrush or whatever, grab some of one chocolate and flick it onto the cake. Dribbles, dots, slashes, swirls--anything goes. Repeat with the other two chocolates. Admire your work.
For best flavor, allow cake to temper on the counter for a good 1 1/2 hours before slicing.
Notes
To Cook in a Pressure Cooker Place a trivet or a small rack inside your pressure cooker. Add 2 cups of water. Fashion a long sling out of heavy duty aluminum foil folded over longways a couple of times. Drape that over the trivet/rack and up the sides of the pan. This is what you'll use to remove the pan after cooking. Place the filled cake pan on the trivet/rack, attach lid and heat on high until you achieve high pressure. Moderate the heat to maintain that pressure for a total of 20 minutes. On my electric range, that meant 2 minutes off the heat, 2 minutes on the hot-but-off burner and then 16 minutes at medium-low heat. When the timer goes off, remove from the heat and let the pressure release naturally, about 7-10 minutes. Remove the lid carefully and use the sling to lift your guy out and place him on a rack. Cool to room temperature, decorate and then chill. For a super duper treat (either with the pressure cooker method or with the oven method) eat a piece just barely warm. Heaven.