01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or grease thoroughly with butter.
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, beating 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 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 with an electric mixer until completely smooth. Add sugar, egg, and vanilla; continue mixing 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 spread and level the surface.
07 - Generously sprinkle each cup with your selected toppings—mini chocolate chips, chopped nuts, crushed Oreos, and mini M&Ms. Press lightly to ensure adhesion.
08 - Bake for 22 to 25 minutes until cheesecake centers are set and brownie edges appear firm but slightly fudgy. Centers should not jiggle when pan is gently shaken.
09 - Let cups cool in the pan for 10 minutes before transferring to a wire rack. Refrigerate for at least 1 hour to allow flavors to meld and texture to firm before serving.