Line an 8x8 or a 9x9 baking dish with parchment paper, set aside. Place the chocolate chips in a large bowl and pour the sweetened condensed milk over them.
Microwave for 1 minute and 30 seconds on high. Let stand for 1 minute and stir until smooth. If the chocolate chips did not melt completely, microwave in 15-second intervals, stirring in between until smooth.
Add the vanilla and sea salt, stir it in until combined.
Fold in ¾ cup of the walnuts until thoroughly mixed in.
Pour the fudge into the prepared baking dish and smooth out the top. Press in the remaining walnuts on top.
Cover with foil or plastic wrap and place in the fridge for 15 minutes or until set. Take the fudge out of the dish by using the parchment paper to lift it up. Cut into squares and serve.
Notes
This recipe can easily be doubled in a 9x13-inch pan.
You can use any kind of nuts that you'd like.
We like semi-sweet chocolate chips for this but you can use your favorite as long as it is high quality.