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Homemade Blackberry Crisp Ice Cream

Homemade blackberry crisp ice cream with a deep purple blackberry swirl, creamy custard, and buttery oat crumble pieces folded throughout. Sweet-tart fresh blackberries meet crunchy baked oat crisp in a scoopable summer frozen dessert.
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Prep Time 25 minutes
Cook Time 20 minutes
chilling + freezing 4 hours 4 minutes
Total Time 4 hours 49 minutes
Servings: 8 servings
Course: Dessert
Cuisine: American
Calories: 420
Ingredients Equipment Method Notes

Ingredients
  

Blackberry compote
  • 2 cup fresh blackberries Use fresh for best color and tart-sweet flavor.
  • 0.25 cup granulated sugar Reserve 1/4 cup for the blackberry simmer; keep the remaining sugar for custard.
  • 1 tbsp lemon juice Adds brightness to the blackberry swirl.
Ice cream base
  • 2 cup heavy cream Provides richness for a creamy texture.
  • 1 cup whole milk Helps the custard churn smoothly.
  • 4 egg yolks Thickens custard to a scoopable freeze.
  • 0.25 cup granulated sugar Second 1/4 cup is for the custard.
  • 1 tsp vanilla extract Stir in after straining for a clean flavor.
  • 0.25 tsp salt Balances sweetness.
Oat crisp
  • 0.5 cup oats Baked into golden oat crumble for crunchy pieces.
  • 0.25 cup flour Helps crisp up the oat crumble.
  • 3 tbsp butter Use for buttery crunch.
  • 2 tbsp brown sugar Adds caramel-like depth to the crumble.

Equipment

  • 1 ice cream maker
  • 1 Dutch oven
  • 1 sheet pan

Method
 

Simmer the blackberry compote
  1. Simmer fresh blackberries with 1/4 cup granulated sugar and lemon juice for 8 minutes until jammy, stirring occasionally to prevent scorching.
  2. Cool the blackberry mixture, leaving some whole berries for visible purple swirls in the finished ice cream.
Bake the oat crisp
  1. Mix oats, flour, butter, and brown sugar into crumbles, ensuring the mixture holds together loosely when pressed.
  2. Bake at 350F for 12-15 minutes until golden, then cool completely and break apart into crisp pieces.
Cook the custard and chill
  1. Heat heavy cream and whole milk until steaming, not boiling, then hold the temperature just below a simmer.
  2. Whisk hot dairy into egg yolks beaten with the remaining 1/4 cup granulated sugar until smooth.
  3. Cook the custard while stirring until it reaches 175F, thick enough to lightly coat the back of a spoon.
  4. Strain the custard, then stir in vanilla extract and salt, and cool to room temperature.
  5. Refrigerate the custard for 4 hours until very cold.
Churn, swirl, and freeze
  1. Churn the cold custard in an ice cream maker until it reaches soft-serve thickness.
  2. Transfer to a container in layers, spooning blackberry compote and oat crisp pieces throughout while transferring.
  3. Freeze until firm.

Notes

Pro tip: chill the custard until it’s fully cold before churning—this helps the custard thicken and prevents icy texture. Store in the freezer for up to 2 months in a tightly sealed container. For a dairy-light swap, replace heavy cream with an equal amount of full-fat coconut cream, but expect a slightly different flavor and texture.