In a 5 quart heavy-bottomed kettle, whisk together 2 cups milk, cream, sugar, corn syrup, and salt. Bring to a boil over medium-high heat.
2 cup + 2 tbsp whole milk, 1 ¼ cups heavy cream, ½ cup granulated sugar, 2 tbsp light corn syrup, ½ tsp kosher salt
While the milk mixture is heating, in a separate bowl, whisk together the remaining 2 tablespoons milk and cornstarch to create a cornstarch slurry.
1 ½ tbsp cornstarch, 2 cup + 2 tbsp whole milk
Allow milk mixture to boil for 2 minutes. Remove from heat and slowly whisk in the cornstarch slurry. Return to heat until slightly thickened, about 30 seconds, stirring constantly.
Once thickened, remove from heat and stir in vanilla extract and Fruity Pebbles. Place on the lid to steep and let cool to room temperature.
2 tsp vanilla extract, 2 ½ cups Fruity Pebbles cereal
Strain into an airtight container, squeezing out all extra liquid in cereal. Chill at least 8 hours.
Once chilled, freeze in ice cream maker according to manufacturer's instructions. Mine takes about 25 minutes.
Enjoy right away or place in an airtight container and freeze for 4-6 hours.