1 cup butter, melted, plus more for pan
1 cup unsweetened cocoa powder
2 cups sugar
4 eggs
1 tablespoon pure vanilla extract
1 cup all-purpose flour
1/2 teaspoon kosher salt
10 individual Reese’s Cups, chopped

For the filling:
1/4 cup peanut butter, heated in microwave at 10 second intervals for easy spreading

For the glaze:
3 tablespoons peanut butter
1/4 cup confectioners’ sugar
½ teaspoon pure vanilla extract
1/2 cup heavy cream, plus more if needed

1/2 cup semisweet chocolate chips