01 -
Preheat oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper or lightly grease it.
02 -
In a medium bowl, combine melted butter, 1 cup sugar, eggs, and 1 teaspoon vanilla extract. Stir until well blended.
03 -
Add cocoa powder, flour, salt, and baking powder to the wet mixture. Stir until just combined; do not overmix.
04 -
Pour the brownie batter into the prepared pan, spreading it evenly.
05 -
In another bowl, beat cream cheese, 1/4 cup sugar, egg, and 1/2 teaspoon vanilla extract until smooth and creamy.
06 -
Spoon the cheesecake mixture over the brownie batter in dollops. Use a butter knife to gently swirl the two layers together.
07 -
Warm the blackberry preserves slightly in the microwave. Drizzle over the cheesecake layer and swirl gently with a knife to create a marbled effect.
08 -
Bake for 30–35 minutes, or until a toothpick inserted into the center comes out with just a few moist crumbs.
09 -
Allow the brownies to cool completely in the pan before cutting into squares. Garnish with fresh blackberries if desired.