Choose an 8-by-8-inch square baking pan for thick fudge squares. If you prefer thinner pieces, you can use a slightly larger pan.

Line the pan with parchment paper, leaving a little overhang along two opposite sides. This will make it much easier to lift the fudge out after it has chilled.

Smooth the parchment paper into the corners so that the fudge forms an even layer. You can lightly grease the pan underneath the parchment to help keep the paper in place.

Prepare all four ingredients before melting the chocolate. White chocolate can begin to thicken as it cools, so having everything ready will make the process easier.

Step 2: Prepare the pecans

Measure the chopped pecans and inspect them for any shell fragments.

If you want a deeper nutty flavor, toast the pecans before using them. Spread them in a single layer on a baking sheet and toast at 350°F (175°C) for approximately 5–8 minutes, stirring or checking them regularly to prevent burning.

You can also toast them in a dry skillet over medium-low heat. Stir frequently until they become fragrant, then remove them from the heat immediately.

Allow the pecans to cool completely before adding them to the fudge. Warm nuts can soften the mixture and make it more difficult to control the setting process.

For the best texture, chop the pecans into medium-sized pieces rather than grinding them finely. Larger pieces provide a satisfying crunch and make the fudge look more attractive when cut.

Step 3: Melt the white chocolate and condensed milk

Place the white chocolate chips and sweetened condensed milk in a microwave-safe bowl.

Microwave the mixture at medium power in 20–30-second intervals, stirring thoroughly after each interval. Continue until the chocolate is mostly melted and the mixture becomes smooth.

White chocolate is sensitive to heat, so avoid microwaving it continuously for a long period. Excessive heat can cause the chocolate to scorch or become thick and grainy.

Alternatively, place the white chocolate chips and condensed milk in a heatproof bowl over a saucepan of gently simmering water. Make sure the bottom of the bowl does not touch the water. Stir until the mixture is melted and smooth.

Keep all water and steam away from the chocolate. Even a small amount of unwanted water can interfere with the chocolate’s texture.

Step 4: Add the vanilla and pecans

Once the chocolate and condensed milk have formed a smooth mixture, remove the bowl from the heat.

Stir in the vanilla extract until evenly distributed.

Add the chopped pecans and fold them gently into the mixture with a spatula. Continue mixing until the nuts are spread throughout the fudge.

The mixture should be thick, glossy, and easy to transfer into the prepared pan. If it begins to firm up quickly, work steadily rather than trying to heat it excessively.

Reserve a few pecan pieces if you would like to decorate the top. This is optional and does not change the basic four-ingredient recipe.

Step 5: Transfer the fudge to the pan

Pour or spoon the pecan fudge mixture into the prepared baking pan.

Use a silicone spatula or the back of a spoon to spread it into an even layer. Gently press the mixture into the corners so that the edges are not significantly thinner than the center.

If you reserved extra pecans, sprinkle them over the surface and press them very gently into the mixture.

Smooth the top as much as possible. A flat surface will help the fudge look neat when cut into squares.

Avoid adding extra liquid caramel or milk at this stage. The recipe depends on the balance between the white chocolate and condensed milk to set properly.

Step 6: Chill until firm

Place the pan in the refrigerator and chill for approximately 2–4 hours, or until the fudge is firm enough to slice cleanly.

The exact setting time depends on the temperature of your refrigerator, the thickness of the fudge, and the type of white chocolate used.

For the cleanest cuts, avoid slicing the fudge while it is still soft. If the center feels sticky or bends easily, return it to the refrigerator and allow it to chill longer.

Once firm, lift the fudge from the pan using the parchment paper overhang and transfer it to a cutting board.

Step 7: Slice and serve

Use a sharp knife to cut the fudge into small squares. For neat edges, warm the knife slightly with hot water, dry it thoroughly, and wipe it clean between cuts.

An 8-by-8-inch pan can generally be cut into 25–36 small pieces, depending on the size you prefer.

Arrange the pieces on a serving plate or in small candy cups. The fudge is rich, so small portions are often ideal.

Allow the pieces to stand at room temperature briefly before serving if you prefer a softer texture. Keep any remaining fudge properly stored to maintain its freshness and consistency.