Line an 8x8 or 9x9 square pan with aluminum foil so it comes up the sides and spray it lightly with nonstick cooking spray. Place half the Snickers chunks on the bottom of the pan.

Place chocolate chips into a medium microwave safe bowl and pour sweetened condensed milk over top. Stir together and heat for 30 seconds at a time, stirring in between, until smooth. The mixture will be thick.

Pour mixture into the pan and press evenly. Sprinkle remaining Snickers chunks over top and press them into the top. Cover with aluminum foil and place in the refrigerator until serving. Remove fudge from pan by picking up the aluminum foil and setting on a cutting board. Cut fudge into 20-25 pieces and serve.