Chocolate Peanut Butter Poke Cake

For the Cake

1 box devil’s food cake, plus ingredients called for on box

2 c. peanut butter, melted

1 c. chopped Reese’s

1 c. Reese’s pieces

For the peanut butter frosting

1 c. peanut butter

10 tbsp. unsalted butter, softened to room temperature

2 c. powdered sugar

2 tsp. pure vanilla extract

1/4 tsp. kosher salt

1-2 tbsp. heavy cream