Prepare your pan by lining an 8×8-inch baking dish with parchment paper, leaving some overhang on the sides for easy removal later. This step is crucial for clean-cutting later!
Combine chocolate and condensed milk in a large microwave-safe bowl. The wide bowl gives you room to stir without making a mess.
Microwave in 30-second intervals, stirring thoroughly between each, until the chocolate is about 90% melted (usually takes 1-2 minutes total). Be patient here—chocolate can burn easily if microwaved too long.
Keep stirring off-heat until completely smooth. The residual heat will melt any remaining chocolate chips without risking scorching.
Add the vanilla extract and stir until fully incorporated. This small addition makes a big difference in deepening the flavor.
Pour the mixture into your prepared pan and spread evenly with a spatula. Give the pan a few gentle taps on the counter to release any air bubbles.
Add any optional toppings while the fudge is still warm and press them lightly into the surface.
Refrigerate for at least 2 hours or until completely firm. Patience yields the perfect texture!
Lift the fudge out using the parchment paper overhang and transfer to a cutting board.
Cut into squares with a sharp knife. For clean cuts, wipe the knife with a warm, damp cloth between slices.