Chocolate Peanut Butter Layer Cake

2 cups all-purpose flour

2 cups granulated sugar

3/4 cup unsweetened cocoa powder

2 tsp baking powder

1 1/2 tsp baking soda

1 tsp salt

1 cup whole milk

1/2 cup vegetable oil

2 large eggs

2 tsp vanilla extract

1 cup boiling water

Peanut Butter Filling:

1 cup creamy peanut butter

1/2 cup unsalted butter, softened

2 cups powdered sugar

1/4 cup heavy cream

Ganache:

1 cup semi-sweet chocolate chips

1/2 cup heavy cream