Preheat oven to 350°F. Line a 12- or 24-cup muffin tin with paper liners or spray with non-stick cooking spray.
In the bowl of a stand mixer fitted with the paddle attachment, or in a large bowl with a hand mixer, combine the devil’s food cake mix and the instant chocolate pudding mix. Add the sour cream, vegetable oil, slightly beaten eggs, 2 teaspoons pure vanilla extract, and warm water. Beat on medium speed for about 2 minutes, until the batter is smooth and well combined.
Using a large cookie scoop or a tablespoon, distribute the batter evenly among 24 muffin wells (about 3 tablespoons of batter per well).
Cut each Fun Size Take 5 candy bar in half. Press one half of a candy bar into the center of each filled muffin well. Use a small spoon to gently spread a little batter over the candy halves so they are covered.
Bake in the preheated oven for 20–24 minutes, or until the cupcake tops spring back when lightly touched. A small sink hole around the candy is normal.
Remove the pan from the oven and let the cupcakes cool in the muffin tin for 10 minutes. Then transfer the cupcakes to a wire rack to cool completely before frosting.
To make the peanut butter frosting: in the bowl of a stand mixer fitted with the paddle attachment, or in a large bowl with a hand mixer, cream the softened unsalted butter and creamy peanut butter on medium speed until light and fluffy.
Reduce mixer speed to low and gradually add the sifted confectioners’ sugar until mostly incorporated.
Add 1 tablespoon pure vanilla extract and 6 tablespoons heavy cream. Mix on low until moistened. If the frosting is too stiff, add up to 2 more tablespoons heavy cream (use 1 tablespoon at a time) until you reach a spreadable/pipeable consistency (total 6–8 tablespoons).
Increase speed to high and beat until the frosting is smooth and fluffy.
Pipe or spread the peanut butter frosting onto the cooled cupcakes.
To make the chocolate glaze: place the chopped bittersweet chocolate in a heatproof bowl. In a small saucepan, heat 1/2 cup heavy cream over medium heat until it is very hot and steaming but not boiling.
Pour the hot cream over the chocolate and let sit for about 5 minutes. Whisk until the chocolate and cream are smooth and fully combined.
Whisk in 2 tablespoons honey, 2 tablespoons light corn syrup, and 2 teaspoons pure vanilla extract. Let the glaze cool for about 15 minutes, until slightly thickened but still pourable. (Do not let it sit so long that it hardens.)
Spoon the glaze over the frosted cupcakes, allowing it to drip slightly down the sides. Use only enough glaze to cover the tops without overflowing the liners.
If desired, finish each cupcake with a piece of a Take 5 candy bar. Allow the glaze to set before serving.