Melt the chocolate chips, peanut butter chips and white chocolate in a double boiler over simmering water or using a heavy bottomed saucepan over low heat, until smooth.
Add the peanuts and 3/4 cup toffee bits. Mix until evenly coated.
Using a Tbsp drop clusters onto wax paper or silicone baking mat. Sprinkle tops with remaining toffee bits.
Chill for 1 hour or until set. Store in an airtight container chilled for up to 2 weeks. Bring to room temperature for serving.
Notes
Depending on how the mixture is divided, yield can vary. When making bite size clusters recipe will yield 60 clusters.