If by “3 double batches” you mean three double batches (equivalent to 6 regular batches) of peanut butter fudge, here’s a scaled recipe with detailed instructions.
3 Double Batches Peanut Butter Fudge
Ingredients
6 cups (1.5 kg) creamy peanut butter
3 cups (680 g) unsalted butter
6 teaspoons vanilla extract (2 tablespoons)
12 cups (1.4 kg) powdered sugar, sifted
1 teaspoon salt (omit if using salted butter)
Equipment
Large stockpot or heavy saucepan
Large mixing bowl (if needed)
Wooden spoon or sturdy spatula
Three 9 × 13-inch pans, or one large sheet pan
Parchment paper
Instructions
Step 1: Prepare the pans
1. Line three 9 × 13-inch pans with parchment paper.
2. Lightly grease the parchment if desired.
Step 2: Melt the butter
1. Place the butter in a large stockpot.
2. Melt over low heat, stirring occasionally.
3. Once melted, remove from heat.
Step 3: Add peanut butter
1. Stir the peanut butter into the melted butter.
2. Mix until completely smooth and uniform.
3. Add vanilla extract and salt.
Step 4: Add powdered sugar
1. Add the powdered sugar gradually, about 2 cups at a time.
2. Stir thoroughly after each addition.
3. The mixture will become thick; continue mixing until no dry sugar remains.
Tip: For a batch this large, a stand mixer with a paddle attachment can make mixing easier.
Step 5: Transfer to pans
1. Divide the mixture evenly among the prepared pans.
2. Spread into an even layer using a spatula.
3. Smooth the tops.
Step 6: Cool
1. Allow the fudge to cool at room temperature for 1–2 hours.
2. Refrigerate for another 1–2 hours until firm.
Step 7: Cut and serve
1. Lift the fudge from the pans using the parchment.
2. Cut into squares.
Yield
About 12 pounds (5.4 kg) of fudge.
Approximately 180–216 pieces, depending on how large you cut them.
Storage
Room temperature: up to 1 week in an airtight container.
Refrigerator: 2–3 weeks.
Freezer: up to 3 months, tightly wrapped.
If you’d like a traditional cooked peanut butter fudge recipe (made with sugar and milk and boiled to a specific temperature), I can scale that to 3 double batches as well.