Ingredients

Cooking spray

1 3/4 c. all-purpose flour  

1 1/2 tsp. baking powder

1/2 tsp. kosher salt 

3 large eggs, room temperature

1 c. granulated sugar

1/2 c. (1 stick) butter, melted 

2/3 c. whole milk, room temperature

1 1/2 tsp. pure vanilla extract

1/2 c. granulated sugar

3 tbsp. cornstarch

1/4 tsp. kosher salt

2 c. whole milk

4 large egg yolks

2 tbsp. butter

1 tsp. pure vanilla extract

1/4 c. heavy cream

1 c. dark chocolate chips 

1 tbsp. corn syrup

Preparation

Step 1Make the cake: Preheat oven to 350°. Grease a 9" cake pan with cooking spray. Line bottom of pan with parchment and grease parchment. In a medium bowl, whisk together flour, baking powder and salt. Step 2In a large bowl, beat eggs and sugar on medium-high until thick, light in color, and starting to hold its shape, about 8 minutes.  Step 3Add dry ingredients and milk, melted butter, and vanilla into wet ingredients. Mix on low speed, until just combined.  Step 4Scrape batter into prepared pan. Bake until golden and a toothpick inserted into the center comes out clean, about 40 to 45 minutes. Let cool for 15 minutes in the pan, then remove from pan and cool completely on a wire rack.   Step 5Make the custard: In a medium saucepan, whisk sugar, cornstarch, and salt. Add milk and egg yolks and whisk until well combined. Add butter and place over medium heat. Bring to a boil, whisking constantly. Continue whisking until thickened, about 4 minutes. Step 6Remove saucepan from heat and scrape cream into a medium heatproof bowl. Cover top directly with plastic to prevent a crust from forming. Refrigerate until well chilled, at least 2 hours. Step 7Whisk vanilla into chilled pastry cream until smooth. Step 8Cut cake in half horizontally using a large serrated knife. Place bottom half on a platter or plate, cut side up. Spread chilled pastry cream over top. Sandwich with remaining half of cake, cut side down.  Step 9In a medium microwave safe bowl, heat cream until bubbling. Add chocolate chips and corn syrup. Cover with a plate and let sit 5 minutes. Remove plate and stir until smooth. Pour chocolate over top of cake. Let set in refrigerator 30 minutes before slicing and serving.

Have you tried this yet? Let us know how it went in the comments below!