Chocolate and peanut butter bundt - a special request

Ok so I've just moved back to Dublin and my precious bundt pan from Bali is still in transit somewhere between here and there. Well, a baker just ain't a baker unless she has her bundt pan so I headed into the city on a mission to find one. It took awhile, and I did end up with blisters on my feet. I also had to spend the entire search convincing my younger brother that every step we took in this mission was a step closer to obtaining a baking pan that created a piece of heaven. Naturally, I had to live up to this statement. I mentioned some flavours and he jumped at peanut butter and chocolate. So that's what I made. This is a delightful cake. Richly chocolately but yet a nice nutty surprise in the middle. And the verdict from my brother was a big thumbs up followed by a discussion on how the bundt cake does seem to just epitomise the absolute essence of yumminess in its shape, size, form and ultimately taste. I must say that since I first discovered the bundt I have developed a complete and utter love for it. I do find it aesthetically to be such an attractive cake shape that it surprises me that so many shops here had no pans available for sale. I could spend hours salivating over the many shapes and sizes of bundt pans available in America and want to cry that hardly any are available here. How could anyone not fall in love with this charming cake form? As you can see from the photos, I didn't even manage to get the chocolate drizzle on before a piece had gone!

Peanut Butter and Chocolate Bundt

For the filling :
2/3 cup peanut butter
1/3 cup cream cheese, softened
1 tablespoon butter, softened
3 egg yolks
1 teaspoon vanilla
1/3 cup granulated sugar
2 tablespoons all-purpose flour

For the cake batter :
1 3/4 cups all-purpose flour
1/2 teaspoons baking soda
1/2 teaspoons salt
12 tablespoons natural cocoa powder
3/4 cup boiling water
3 ounces quality bittersweet chocolate, chopped
12 tablespoons sour cream
12 tablespoons butter, softened
1 2/3 cups packed brown sugar
2 eggs
2 teaspoons vanilla

Preheat oven to 350

To make the filling :
In a large mixing bowl, beat peanut butter, cream cheese and butter until combined. Add egg yolks, one at a time, and beat until combined. Mix in vanilla. Be sure to scrape down the sides. Pour in sugar and flour, mix until combined. Fit a pastry bag with a large plain tip and scoop the filling into the bag. Place in the refrigerator until ready to use.

To make the batter :
In a medium bowl, whisk together flour, baking soda and salt.
In a medium metal or glass bowl, add cocoa and whisk in boiling water. Add in chopped chocolate and whisk until smooth. Mix in sour cream.
In large mixing bowl, cream together butter and sugar until light and fluffy. Mix in eggs, one at a time, and then beat in vanilla. Alternatively mix in the dry ingredients and the cocoa mixture, beginning and ending with the flour. For example - mix in 1/3 of the flour, 1/2 of the cocoa mixture, another 1/3 of the flour, the rest of the cocoa mixture and finishing with the final 1/3 of the flour. Mixing just until combined with each addition.

Spray a bundt pan with a nonstick spray that has flour included (like Baker's Joy or Pam with Flour). Spoon a little less than half of the batter into bottom of the bundt pan. Using the pastry bag that has the peanut butter mixture, carefully pipe a ring of the filling over the center of the chocolate batter. Pour the remaining batter on top and gently tap the pan to remove air bubbles.

Bake until top springs back when lightly touched or a toothpick comes out mostly clean with a few crumbs attached - about 50-60 minutes. Remove from the oven and set on a wire rack to cool for 5 minutes. Place a wire cooling rack on top of the cake and carefully turn over - remove the pan and let cool completely.