Eclair Cake

1. Stage

Place egg yolks in a medium heat-safe bowl and whisk until lightened in color, about 2 minutes. 

2. Stage

In a medium pot, whisk together granulated sugar and cornstarch. Slowly add milk while whisking. Place pot over medium heat and bring to a boil, whisking constantly. Once mixture comes to a boil reduce heat to low, then slowly pour about ½ cup of the mixture into the yolks while whisking. 

3. Stage

Pour warmed egg mixture back into pot while whisking. Let boil until thickened to a pudding-like consistency, 1 to 2 minutes. Remove from heat and whisk in butter and vanilla. 

4. Stage

Pour mixture through a fine mesh strainer into a clean bowl. Press plastic wrap directly against mixture and refrigerate until chilled, at least 1 hour. 

5. Stage

Whip the cream: In a medium bowl add heavy cream and powdered sugar. Using a hand mixer, beat until stiff peaks form. 

6. Stage

Give chilled pastry cream a stir, then fold whipped cream in until just combined. 

7. Stage

Make the ganache: Place chocolate chips in a small heat-safe bowl. In a small pot over medium heat, heat cream until simmering. Pour over chocolate chips and let sit undisturbed for 2 minutes, then whisk until smooth. Let cool to room temperature while assembling. 

8. Stage

Assemble: In a 8” square pan, place an even layer of graham crackers, breaking up sleeves as needed to completely cover the bottom. Top with half of the pastry cream. Repeat with another layer of graham crackers and remaining cream, then top with a third layer of graham crackers. 

9. Stage

Pour ganache over top and smooth into an even layer. Cover and refrigerate until well chilled, at least 4 hours and up to overnight.