Preheat the oven to 350°F. Butter two 8-inch round pans and line the bottoms with parchment paper; butter the parchment.
In a medium bowl whisk together 1 cup melted butter and 1 cup unsweetened cocoa powder until the cocoa is dissolved and the mixture is smooth.
Add 2 cups sugar and stir until combined. Add 4 eggs one at a time, mixing after each egg until incorporated. Stir in 1 tablespoon pure vanilla extract.
Add 1 cup all-purpose flour and 1/2 teaspoon kosher salt; stir or fold until the flour is no longer visible. Fold in 10 chopped Reese's Cups.
Divide the batter evenly between the prepared pans and smooth the tops. Bake about 25 minutes, or until the centers are set and a toothpick inserted near the center comes out with moist crumbs but not wet batter.
Remove the pans from the oven and let the cakes cool in the pans on a wire rack for 10–15 minutes. Run a knife around the edges, invert the cakes onto the rack, peel off the parchment, and let the cakes cool completely.
Place one cooled cake layer on a cake plate or serving platter. Heat 1/4 cup peanut butter in the microwave in 10-second intervals, stirring between intervals, until spreadable. Spread the warmed 1/4 cup peanut butter evenly over the first layer, then top with the second cake layer.
In a bowl combine the remaining 3 tablespoons peanut butter, 1/4 cup confectioners' sugar, 1/2 teaspoon pure vanilla extract, and 1/2 cup heavy cream. Whisk until smooth; add more heavy cream, if needed, to reach a pourable glaze consistency.
Pour the glaze over the top of the torte and use a small knife to spread it, allowing the glaze to drip down the sides.
Melt 1/2 cup semisweet chocolate chips in a double boiler, stirring until smooth. Drizzle the melted chocolate over the glazed torte.
Let the glaze and chocolate set briefly before slicing. Cut into slices and serve.