Fill a small cooking pot with water and bring it to a simmer.

Place a heatproof large bowl over the pot and add ½ cup of room-temperature butter to it.

Toss in 1 cup of chopped dark chocolate and stir frequently until it’s fully melted.

Pour ½ cup of brown sugar and ½ cup of granulated sugar into the melted chocolate. Whisk until the sugar is dissolved into the chocolate mixture.

Crack 3 medium-sized room temperature eggs into the bowl. Add the eggs one at a time and stir between each addition.

Add 1 tsp of vanilla essence and mix until smooth.

Place a fine mesh strainer over the mixing bowl and sift in ½ cup of all-purpose flour, ¼ cup of cocoa powder and ¼ tsp of salt.

Gently fold the dry ingredients into the wet mixture with the help of a spatula.

Reserve ⅓ cup of brownie batter in a small bowl and set it aside for later use.

Take an 8x8-inch baking pan and line it with parchment paper.

Pour the brownie batter into the prepared pan and spread evenly using a spatula.

Give the baking pan a gentle tap to remove air bubbles and set it aside for later.

Grab a mixing bowl and add 1¼ cups of room-temperature cream cheese to it. Use a spatula to soften and break it down.

Add ⅓ cup of granulated sugar and 1 tsp of vanilla essence.

Crack 1 medium-sized egg into the bowl and whisk until the mixture is smooth and creamy.

Pour the cheesecake batter over the brownie batter in the pan. Use a spatula to spread it evenly, and tap the pan lightly to remove any air bubbles.

Microwave the reserved ⅓ cup of brownie batter for 10 seconds at the lowest setting.

Spoon small dollops of the brownie mix over the cheesecake layer.

Use a toothpick or knife to swirl the brownie batter into the cheesecake, creating a marbled pattern.

Preheat the oven to 350 degrees Fahrenheit or 180 degrees Celsius, and bake the brownie cheesecake for 25-30 minutes.

Once baked, remove the brownie cheesecake from the oven and place it on a wire rack to cool completely.

Transfer the brownie cheesecake to a cutting board, slice it into squares, and enjoy a deliciously creamy treat!