Filling
2 1/4 cups heavy whipping cream
1/2 cup (packed) golden brown sugar
12 ounces bittersweet or semisweet chocolate, finely chopped
1/2 cup old-fashioned (natural) chunky peanut butter

Cake
2 1/2 cups all purpose flour
1 teaspoon baking powder
1 teaspoon baking soda
1/2 teaspoon salt
10 tablespoons (1 1/4 sticks) unsalted butter, room temperature
1/2 cup old-fashioned (natural) chunky peanut butter
1 pound golden brown sugar
4 large eggs
1 teaspoon vanilla extract
1 cup buttermilk

Frosting
1 1/2 8-ounce packages cream cheese, room temperature
2 cups powdered sugar, divided
6 tablespoons (3/4 stick) unsalted butter, room temperature
1 teaspoon vanilla extract
3/4 cup chilled heavy whipping cream
Butterfinger candy bars, coarsely chopped
Glazed peanuts
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