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+ servings
nine milk bar pie squares on white parchment paper

Milk Bar Pie Squares

Easy milk bar pie squares are ooey-gooey delicious, with an oatmeal crumble crust and a rich filling, just like the classic Milk Bar Pie!
Course Dessert
Cuisine American
Keyword chess pie, crack pie, crack pie recipe, milk bar pie, pie squares
Prep Time 15 minutes
Cook Time 1 hour 20 minutes
Total Time 1 hour 35 minutes
Servings 12
Calories 223kcal


Pie Crust Ingredients

  • 1 17.5 oz oatmeal cookie mix you will need 1 stick of butter, 1 Tbsp. water, and 1 egg for making the cookie mix
  • 3 Tbsp. unsalted butter softened
  • 1 ½ Tbsp. brown sugar

Pie Filling Ingredients

  • ¾ cup granulated sugar
  • ½ cup brown sugar
  • 2 tablespoon nonfat milk powder
  • ¼ teaspoon salt
  • ½ cup unsalted butter softened
  • cup heavy cream
  • 1 tsp. pure vanilla extract
  • 2 Tbsp. corn starch
  • powdered sugar


  • Preheat oven to 350°F.
  • Mix the oatmeal cookie mix: Stir 1 stick softened butter, 1 Tbsp. water, and 1 egg in a medium bowl. Stir in 17.5 oz. box oatmeal cookie mix until you have a stiff dough.
  • Press the dough flat into a greased 9×13″ baking dish and bake for 25-30 minutes or until baked through. Remove from the oven.
  • Let the oatmeal cookies cool completely, then crumble them. Add 2 cups of the crumbled cookie mix with 3 tablespoons of softened butter and 1 ½ tablespoon brown sugar to a food processor, and process until you have a fine crumble.
  • Grease an 8×8″ baking dish and press the oatmeal crumble mix into the bottom of the pan.
  • In a large bowl, whisk together ¾ cup granulated sugar, ½ cup brown sugar, 2 Tbsp. nonfat milk powder, ¼ tsp. salt, ½ cup unsalted softened butter, ⅓ cup heavy cream, 1 tsp. vanilla extract, 4 egg yolks, and 2 Tbsp. corn starch until well-combined.
  • Pour the pie filling mixture over the oatmeal crust. Bake for 30 minutes at 350°F.
  • Reduce heat down to 325°F and bake for an additional 20 minutes until the edges are set and the center is almost set. The center will be slightly jiggly.
  • Remove from the oven and let cool at room temperature. Refrigerate overnight before serving.
  • When ready to serve, sprinkle with powdered sugar, cut into square bars, and enjoy!


  • Make sure to refrigerate for a day before serving.
  • Milk bar pie squares can be refrigerated in an air-tight container or even frozen to store.


Calories: 223kcal | Carbohydrates: 27g | Protein: 1g | Fat: 13g | Saturated Fat: 8g | Cholesterol: 38mg | Sodium: 63mg | Potassium: 40mg | Fiber: 1g | Sugar: 24g | Vitamin A: 453IU | Vitamin C: 1mg | Calcium: 32mg | Iron: 1mg