Ingredients

  • 1/4 cup all-purpose flour
  • 1/4 cup quick-cooking rolled oats
  • 1/4 cup plus 2 tablespoons packed light brown sugar
  • 2 1/4 teaspoons ground cinnamon
  • 4 tablespoons (1/2 stick) unsalted butter, cut into pieces, chilled
  • 2 cups whole milk
  • 2 cups heavy cream
  • 2 cinnamon sticks
  • 1 vanilla bean, split and seeds scraped
  • 8 large egg yolks
  • 1 cup granulated sugar

Method

  • Preheat the oven to 350F.
  • Line a baking sheet with parchment paper.
  • Combine the flour, oats, brown sugar, and ground cinnamon in a food processor and process a few times to combine.
  • Add the butter and pulse until combined.
  • Pat the mixture evenly into a 4-inch square on the baking sheet.
  • Bake until golden brown and crispy, about 15 minutes.
  • Remove and let cool.
  • Chop the cinnamon crunch into small pieces and set aside.
  • Combine the milk, heavy cream, cinnamon sticks, and vanilla bean and seeds in a medium saucepan and bring to a simmer over medium heat.
  • Remove and let steep for 30 minutes.
  • Return to the heat and bring to a simmer.
  • Prepare an ice bath by placing a medium bowl inside a larger bowl filled half full with ice water.
  • Whisk together the yolks and granulated sugar until pale yellow.
  • Slowly whisk in the warm milk mixture.
  • Remove the cinnamon sticks and vanilla bean, return the mixture to the pan, and cook, stirring with a wooden spoon, until the mixture coats the back of the spoon, 3 to 4 minutes.
  • Strain the custard into the bowl set in the ice bath and stir until chilled.
  • Pour the custard into an ice cream maker and freeze according to the manufacturers directions.
  • Fold the cinnamon crunch into the soft ice cream, cover, and freeze until hardened, at least 2 hours.