Step 1 Prepare the pan
Line an 8 x 8 inch baking dish with parchment paper. Make sure the paper extends slightly over the edges so the fudge can be lifted out easily after chilling.

Step 2 Melt the chocolate mixture
In a saucepan, combine the butterscotch chips, white chocolate chips, and sweetened condensed milk. Heat over low to medium heat while stirring continuously.

Step 3 Stir until smooth
Continue stirring until all the chips are fully melted and the mixture becomes smooth and creamy. Be careful not to overheat because chocolate can scorch quickly.

Step 4 Add flavor and texture
Remove the saucepan from heat. Stir in the vanilla extract, salt, and chopped pecans until everything is evenly combined.

Step 5 Transfer to pan
Pour the fudge mixture into the prepared baking dish. Use a spoon or spatula to spread it evenly and smooth the surface.

Step 6 Chill until firm
Place the dish in the refrigerator for at least 2 hours or until the fudge is fully set and firm enough to slice.

Step 7 Cut and serve
Lift the fudge from the pan using the parchment paper. Cut into 16 equal squares and enjoy.