Also known as 2-ingredient fudge, this is the easiest candy recipe as it involves two ingredients, a few minutes in the microwave or stove and some time in the fridge until it firms up. You can use any chocolate flavor, and it's the perfect canvas for add-ins.
Spray or butter a square 8-inch pan and line it with a strip of parchment paper wide as the pan. It will cover the bottom and two sides. Reserve.
Combine 14 to 17 ounces semisweet chocolate chips and 1 can sweetened condensed milk in a medium, microwave-safe mixing bowl.
Microwave in 30-second spurts, mixing well in between, until the chocolate chips melt and turn smooth when stirred.
If using the stove, place the bowl over a saucepan with simmering water that doesn't touch the bottom of the bowl. Stir with a spatula until it melts.
Stir well to integrate both ingredients fully.
Pour the mixture into the prepared pan and spread even, tapping the pan on the counter to flatten.
Place in the refrigerator until set. It's about 2 hours for me, but it might take more or less, depending on your fridge.
Run a smooth-bladed knife around the edges to loosen up the fudge and transfer the whole block to a cutting board. Use the parchment paper to lift the whole piece.
Using a sharp kitchen knife, slice the fudge into 1-inch pieces.
Notes
Amount of chocolate: if mailing it or taking it for a road trip, I recommend using 17 ounces as it will be denser and hold better. You can store the fudge in an airtight container in the fridge for up to 2 weeks or in the freezer for up to 3 months. Use different types of chocolate: use milk chocolate chips, white chocolate chips, butterscotch chips, mint chips or other flavors.