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 - In a medium bowl, melt the butter. Whisk in granulated sugar and brown sugar until glossy and well combined. Add eggs and vanilla, mixing until smooth.
03 - Sift cocoa powder, flour, and salt into the butter mixture. Fold gently until just combined—avoid overmixing to prevent tough texture.
04 - Divide the brownie batter evenly among the prepared muffin cups, using about 1 heaping tablespoon per cup.
05 - In a separate bowl, beat the softened cream cheese until completely smooth. Add sugar, egg, and vanilla, continuing to beat until creamy and free of lumps.
06 - Spoon approximately 1 tablespoon of cheesecake filling over each brownie base. Gently smooth the tops with the back of a spoon.
07 - Generously sprinkle each cup with your selection of mini chocolate chips, chopped nuts, crushed Oreos, and mini M&Ms, pressing lightly to adhere.
08 - Bake for 22 to 25 minutes until the cheesecake layer is set and the brownie edges feel firm to the touch. The centers should still have a slight jiggle.
09 - Let cool in the pan for 10 minutes before transferring to a wire rack. Refrigerate for at least 1 hour before serving to achieve the ideal creamy texture.