Prepare 8 x8" pan with cooking spray.
Melt butter in a small pan over low to medium heat.
Once melted watch the butter and stir until the butter foams and turns brown. Be very careful it burns easily.
Add the marshmallows to the browned butter and stir until melted.
Add the rice krispie cereal and stir until combined.
Pour and press into the prepared pan.
While warm sprinkle the top with the mini-peanut butter cups.
In a small bowl add peanut butter and melt in the microwave, about 30-50 seconds.
Pour the peanut butter over the mini-peanut butter cups then set pan aside.
Pour chocolate chips into a bowl and set aside.
In a small pan over low heat, warm the heavy cream until small bubbles appear around the edges.
Pour cream over the chocolate chips.
Wait a few minutes until the cream melts the chips and then whisk until smooth.
Pour mixture over the cereal treats and smooth out.
Then refrigerate for a least 30 minutes, cut ,and enjoy!