Preheat your oven to 325°F (160°C). In a medium bowl, combine graham cracker crumbs, cocoa powder, brown sugar, and melted butter. Mix until the texture resembles wet sand. Press the mixture firmly into the bottom of a 9-inch springform pan, creating an even layer. Bake the crust for 10 minutes, then remove it from the oven and let it cool completely.

In a large mixing bowl, beat the softened cream cheese with an electric mixer until smooth and creamy. Gradually add granulated sugar while continuing to mix, ensuring everything is well combined. Next, blend in vanilla extract and a pinch of salt. Add eggs one at a time, mixing gently between each addition to maintain a smooth texture for your Ultimate Coffee Lover's Cheesecake.

Slowly pour in the cooled espresso along with the coffee liqueur if you’re using it. Mix on low speed just until everything is fully incorporated and your filling is silky smooth.

Carefully pour the cheesecake filling over the cooled crust in your springform pan. Place it in the preheated oven and bake for 55-60 minutes.

Once baked, turn off the oven and crack the door open. Let the cheesecake cool gradually in the oven for about 1 hour; this helps prevent it from cracking.

When ready to serve the Ultimate Coffee Lover's Cheesecake, carefully release it from the springform pan. For an added touch, garnish with chocolate shavings or coffee beans, if desired.