Preheat your oven to 325°F and line a 9x9 baking dish with parchment paper. The parchment will make it easier to pull those gorgeous bars out later.
In a mixing bowl, combine the Oreo crumbs, sugar, and espresso powder. Give it a quick mix with a fork so everything is evenly combined.
Add in the melted butter and the egg white, and mix until you’ve got a thick, Oreo paste. Press this mixture evenly into your prepared baking dish—use your hands or the back of a spoon for a smooth finish.
Bake the crust for 15 minutes, then let it cool for at least 10 minutes. Your kitchen already smells amazing, doesn’t it?
While your crust cools, grab a large bowl. Add the softened cream cheese and 3/4 cup of sugar, then blend with a hand mixer until smooth and lump-free.
Next, pour in the vanilla extract and 1/3 cup of heavy cream. Blend again until the mixture is silky smooth.
Create the Espresso Swirl: Set aside the rest of the cream cheese mixture for now. Take 3-4 large dollops of the cream cheese filling and plop them onto the Oreo crust—make sure they’re spaced apart.
In a small microwavable bowl (or saucepan), heat the remaining 1/3 cup of heavy cream until warm. Stir in the instant espresso powder and cocoa powder until completely melted and smooth.
Add this espresso mixture to the rest of the cream cheese filling. Blend it up until you have a creamy, coffee-infused filling.
Spoon the espresso filling in and around the dollops of regular cream cheese filling in your baking pan. Now grab a butter knife and drag it through the two fillings, creating pretty swirls. Don’t overdo it—a few swirls will look effortlessly beautiful!
Lightly shake the pan and tap it gently on the counter to even everything out without messing up those perfect swirls.
Sprinkle a little extra espresso powder or coffee beans on top if you’re feeling fancy, then pop the pan in the fridge. Let it chill for at least 4 hours.
Once chilled, cut your bars into neat squares. Pro tip: Clean your knife between slices for that perfect, bakery-style finish.