In a large Microwave safe bowl, melt the chocolate at 15-second intervals, until completely melted, and stir until smooth.
Add the can of sweetened condensed milk, and stir until smooth.
Break the Peanut Butter Cups in half, and add to the chocolate mixture.
Add the crushed Oreo's, and the mini M & M's, and stir all ingredients until blended.
Spray an 8 X 8 pan with cooking spray, and line with Parchment paper.
Pour the fudge into the pan, and spread smooth and even.
Place the pan in the refrigerator, overnight for the best results. When ready to serve, cut in small squares, serve, and Enjoy!