Black Forest Cupcakes

This is another divine recipe from Martha Stewart's Cupcakes. I made a few changes to cut the processing time and I personally believe that I didn't change the integrity of the recipe or the taste.

Ingredients:
1 cup plus 2 tablespoons (2 & 1/4 sticks) unsalted butter, room temperature, plus more for tins
1 cup plus 2 tablespoons unsweetened Dutch-process cocoa powder, plus more for tins
2 & 1/2 cups plus 2 tablespoons all-purpose flour
2 teaspoons baking soda
1/8 teaspoon salt
1 cup granulated sugar
1 cup packed dark-brown sugar
3 large eggs, room temperature
3/4 cup sour cream
1 & 1/2 cups buttermilk
1 jar (12 ounces) preserved cherries in light syrup (I used a can of cherry pie filling)
2 tablespoons kirsch (cherry-flavored brandy) (I used more because I didn't have the syrup from the jarred preserved cherries)
Pastry Cream (I used a small box of vanilla pudding, cooked variety)
Chocolate Ganache Glaze

Directions:
1. Preheat oven to 350 degrees. Brush standard muffin tins with butter; dust with cocoa powder, tapping out excess. Whisk together flour, cocoa, baking soda, and salt.
2. With an electric mixer on medium-high speed, cream butter and granulated sugar until pale and fluffy. Add brown sugar, and beat until fluffy. Add eggs, one at a time, beating until well incorporated and scraping down sides of bowl as needed. Mix in sour cream. Reduce speed to low. Add flour mixture in three batches, alternating with two additions of buttermilk, and mixing until just combined after each.
3. Divide batter evenly among prepared cups, filling each three-quarters full. Bake, rotating tins halfway through, until tops are firm to the touch and a cake tester inserted in centers come out clean, about 20 minutes. Transfer tins to wire racks to cool completely before removing cupcakes. Cupcakes can be stored overnight at room temperature, or frozen up to 2 months, in airtight containers.
4 To finish, drain cherries, reserving 1/4 cup plus 2 tablespoons syrup. Cut each cherry in half. Combine reserved syrup and kirsch in a small bowl. Using a serrated knife (and a gentle sawing motion), split cupcakes in half horizontally. Brush both cut sides with kirsch mixture. Arrange halved cherries over cupcake bottoms; spoon about 1 heaping tablespoon pastry cream evenly over cherries. Replace top halves. Spoon 2 tablespoons glaze over tops. Refrigerate 30 minutes before serving.

Ingredients for Pastry Cream:
4 large egg yolks
1/2 cup sugar
1/2 cup cornstarch
Pinch of salt
2 cups milk
1 & 1/4 teaspoons pure vanilla extract

Directions:
1. Whisk egg yolks until smooth in a large bowl. Combine sugar, cornstarch, and salt in a medium saucepan, and heat over medium. Stirring constantly, gradually add milk in a slow, steady stream, and cook until mixture thickens and begins to bubble, about 5 minutes.
2. Whisking constantly, slowly pour one third of the milk mixture into egg yolks (this step is called tempering, which keeps the yolks from curdling). Pour mixture into remaining milk mixture in saucepan. Cook over medium heat, whisking constantly, until mixture comes to a full boil and is thick enough to hold its shape when lifted with a spoon, 2 to 4 minutes. Remove from heat; stir in vanilla.
3. Strain mixture through a fine sieve into a heatproof bowl. Cover with parchment paper or plastic wrap, pressing it directly on surface to prevent a skin from forming. Refrigerate until chilled and firm, at least 2 hours (or up to 2 days).

Ingredients for Chocolate Ganache Glaze:
6 ounces semisweet chocolate, finely chopped
2/3 cup heavy cream
1 tablespoon light corn syrup

Directions:
1. Place chocolate in a medium heatproof bowl. Bring cream and corn syrup just to a simmer in a small saucepan over medium-high heat; pour mixture over chocolate. Let stand, without stirring, until chocolate begins to melt.
2. Using a flexible spatula, gently stir chocolate and cream until totally combined; begin near the center of the bowl and gradually work your way toward the edge, puling in as much chocolate as possible, until the mixture is smooth and glossy. (If any chocolate pieces remain, strain mixture through a fine sieve and discard solids). If not using immediately, glaze can be refrigerate up to 5 days in an airtight container. Reheat gently before using.