Step 1

Line an 8x8 baking dish with foil or parchment paper, leaving overhangs around the edges. Grease the foil with butter.

Step 2

Place a medium saucepan over low heat. Add milk chocolate chips, unsweetened chocolate, and butter. Stir until smooth and melted.

Step 3

Turn off the heat and mix in condensed milk, peppermint extract, and vanilla extract.

Step 4

Transfer the mixture into a bowl and beat with an electric mixer at low speed for 1 minute. Increase speed to high and beat for 1 more minute.

Step 5

Refrigerate the mixture for 15 minutes, taking it out every 5 minutes to whisk it by hand. Beat with an electric mixer for 2 minutes.

Step 6

Pour the mixture and spread evenly into the greased baking dish and refrigerate until firm, about 2 hours.

Step 7

Using the overhangs, lift the fudge out of the pan. Slice it with a sharp knife into 1/2-inch squares. Enjoy!