Place finely chopped chocolate in a heatproof and microwave-safe mixing bowl.
Into a saucepan, add the cream and peanut butter. Heat over medium heat until the mixture starts simmering. Then, whisk to incorporate the peanut butter into the cream.
Pour the cream and peanut butter mixture into the bowl with the chocolate. Whisk until the chocolate has melted and emulsified with the cream. If the chocolate hasn’t melted completely, heat the mixture in the microwave for 10-15 seconds, then whisk again. Optionally, you can use an immersion blender to stir the mixture, making it extra smooth.
Once the mixture has a homogeneous consistency, cover it with plastic wrap so it touches the surface of it.
Refrigerate for at least 6 hours or overnight.
Once the time is up, the ganache should be firm but scoopable. Leave it at room temperature for 10-20 minutes to soften.
Then, mix the ganache using a rubber spatula until it has a pipeable consistency. Transfer it into a piping bag and use it as desired. Or, you can whip it for 10 seconds to achieve a soft and fluffy consistency and use it.