01 - Preheat the oven to 350°F. Line a 12-cup muffin tin with paper liners or grease thoroughly with butter or cooking spray.
02 - Melt butter in a medium bowl. Whisk in granulated sugar and brown sugar until mixture appears glossy and smooth. Add eggs and vanilla extract, mixing until fully incorporated.
03 - Sift cocoa powder, flour, and salt into the wet mixture. Fold gently until just combined—avoid overmixing to prevent tough texture.
04 - Distribute brownie batter evenly among the prepared muffin cups, using approximately 1 heaping tablespoon per cup.
05 - In a separate bowl, beat softened cream cheese until completely smooth. Add sugar, egg, and vanilla extract, continuing to beat until creamy and free of lumps.
06 - Spoon about 1 tablespoon of cheesecake filling over each brownie base. Gently smooth tops with the back of the spoon to create an even layer.
07 - Generously sprinkle each cup with your choice of loaded toppings—chocolate chips, chopped nuts, crushed Oreos, or mini M&Ms. Press toppings lightly into the cheesecake layer.
08 - Bake for 22 to 25 minutes until cheesecake centers are set and brownie edges appear firm. Centers should still have a slight jiggle.
09 - Let cups cool in the muffin tin for 10 minutes. Transfer to a wire rack to cool completely, then refrigerate for at least 1 hour before serving for optimal texture and flavor.