Step 1

Prepare an 8x8 or 9x9 square pan with parchment paper or foil. Leave an overhang so you can easily lift the fudge out of the pan

Step 2

Place peanut butter chips, peanut butter, sweetened condensed milk, and vanilla in a microwave-safe bowl. Add a pinch of salt, if desired. Microwave on high in 30-second increments until melted, not boiling, 1 ½ to 2 minutes. Stir until the mixture is completely combined and smooth.

Step 3

Immediately pour the fudge mixture into the prepared pan, smoothing out the top with a knife or spatula.

Step 4

Optional: lightly press your choice of toppings like peanut butter cups or salted peanuts on top of the fudge while it’s still soft.

Step 5

Chill in the refrigerator until firm, 1-2 hours. Lift the fudge out of the pan and place the slab on a cutting board. Use a sharp knife to cut into 1 to 1 ½ inch squares.

Step 6

Store in an airtight container between layers of wax paper at room temperature in a cool dry place for about a week or two or in the refrigerator for 2-3 weeks.

Step 7

To freeze fudge, first tightly wrap it in waxed paper and again in aluminum foil or plastic wrap. Place it in a freezer storage bag or airtight container and freeze for up to 3 months.