Place the peanut butter, butter, and chocolate chips in a saucepan. Melt them on low to medium heat. Stir occasionally until the mixture is smooth and lump-free.
⅓ cup Butter, ¼ cup Peanut butter, 2 cup Semi-sweet chocolate chips
Remove from the heat, add the vanilla, and mix. Let the mixture cool down for 15 minutes.
1 teaspoon Vanilla extract
Gently mix in the marshmallows and mix.
4-5 cups Marshmallows
Line a 9X9 square pan with parchment paper. Pour the mixture into the pan and smooth the top with a spatula. Place the pan in the fridge to cool down, and solidify.