Start by making your cereal milk. Combine the milk, cream, and Cocoa Pebbles in a bowl. Stir to make sure the cereal is coated in the milk/cream, and set aside in the fridge to soak for 60 minutes
For the crust, stir together the finely crushed Cocoa Pebbles, cocoa, and salt, then mix in the melted butter
Press your crust firmly into a 10-inch pie plate. I like to press the sides in first, before pressing the bottom into an even layer. Use a flat-bottomed cup to gently but firmly give the crust a final press so it’s nice and compact. Place in the freezer for 15 minutes
Preheat oven to 325°F
Bake for 10 minutes, remove from the oven, and cool completely
Strain your cereal milk into a bowl through a fine mesh sieve, pressing gently on the cereal to extract flavor. Only keep 2 cups' worth and discard the excess (or drink it!)
In a pot, whisk together the sugar, cornstarch, and salt
Whisk in the 2 cups of cereal milk and egg yolks until smooth
Cook over medium-high heat, whisking constantly, until thickened and starts to bubble (approx. 6-8 minutes). Once your mixture bubbles, whisk for another 10 seconds to fully activate that cornstarch so the pie sets properly
Remove from the heat and whisk in the butter, one piece at a time, and then the vanilla
Pour into the cooled crust and press a piece of parchment paper directly onto the surface. Chill for at least 4 hours, but preferably overnight
Set your oven to 325°F
For the Cocoa Pebble crunch, combine the cereal, flour, and salt.
Melt the butter, pour it over the dry ingredients, and stir until evenly coated
Spread the mixture in an even layer on a parchment-lined baking sheet, with the mixture touching
Bake for 10 minutes, stirring once halfway through
Cool completely. It will crisp up and cluster together a little as it cools.
Make your whipped cream by adding the cream and powdered sugar to a bowl and beating until it reaches medium peaks
Remove your chilled pie from the fridge, take off the parchment paper, and top with your whipped cream
Top with the Cocoa Pebble crunch right before serving so it stays crunchy. Store the rest in an airtight container with a paper towel until ready to use