01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or grease thoroughly.
02 - Melt butter in a medium bowl. Whisk in granulated and brown sugars until glossy. Beat in eggs and vanilla until smooth.
03 - Sift cocoa powder, flour, and salt into the wet mixture. Stir until just combined—avoid overmixing.
04 - Distribute brownie batter evenly among muffin cups, using about 1 heaping tablespoon per cup.
05 - Beat softened cream cheese until smooth. Add sugar, egg, and vanilla; mix until creamy and lump-free.
06 - Spoon approximately 1 tablespoon cheesecake mixture over each brownie base. Gently smooth tops.
07 - Generously sprinkle each cup with mini chocolate chips, nuts, crushed Oreos, and mini M&Ms.
08 - Bake 22–25 minutes until cheesecake is set and brownie edges feel firm.
09 - Cool in pan 10 minutes, then transfer to wire rack. Refrigerate at least 1 hour before serving.