Start by gathering your equipment. You’ll need a heavy-bottomed saucepan to prevent burning the mixture. Also, have a candy thermometer to check the sugar mixture's temperature and a wooden spoon for stirring. Don't forget a parchment-lined baking dish for the fudge to set.

In your saucepan, combine the whole milk, cocoa powder, softened butter, and granulated sugar. Stir gently over medium heat until the sugar dissolves completely. It’s crucial to avoid boiling at this stage to maintain the smooth texture.

Once the sugar has dissolved, increase the heat. Bring the mixture to a boil without stirring. Keep an eye on it; you’ll want to reach the soft-ball stage, which is about 235°F (112°C). Using a candy thermometer helps here! A little patience goes a long way.

After you’ve reached the desired temperature, remove the saucepan from heat. Let it cool for about five minutes. You don't want to burn your hands! Then, stir in the vanilla extract and espresso powder. Now, the fun part begins—you’ll need to beat the mixture. I prefer using a handheld mixer because it cuts down the time and effort. Beat until it thickens and loses its glossy sheen.

Now you’re ready to pour the fudge into your prepared baking dish. Use a spatula to smooth it out evenly. Let it sit at room temperature for about 4 hours or until it firms up completely.

Once the fudge has set, cut it into small squares and enjoy! There’s nothing quite like the first taste of freshly made fudge.