01 - Preheat 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 microwave-safe bowl. Whisk in granulated sugar and brown sugar until mixture appears glossy and smooth. Add eggs and vanilla extract, stirring until fully incorporated.
03 - Sift cocoa powder, flour, and salt directly into the wet mixture. Fold gently with a spatula until just combined—avoid overmixing to prevent dense texture.
04 - Divide brownie batter evenly among prepared muffin cups, approximately 1 heaping tablespoon per cup. Tap pan gently on counter to release air pockets.
05 - In a separate clean bowl, beat softened cream cheese with an electric mixer until completely smooth. Add sugar, egg, and vanilla extract, continuing to beat until creamy and free of lumps.
06 - Spoon approximately 1 tablespoon of cheesecake filling over each brownie base. Use the back of the spoon to gently smooth and level the surface.
07 - Generously sprinkle each cup with desired toppings: mini chocolate chips, chopped nuts, crushed Oreos, and mini M&Ms. Press lightly to ensure toppings adhere.
08 - Bake for 22 to 25 minutes until cheesecake filling is set and edges of brownie cups appear firm but centers retain slight moisture.
09 - Allow cups to cool in pan for 10 minutes before carefully transferring to a wire rack. Refrigerate for at least 1 hour to achieve optimal texture before serving.