Step 1: Prepare the Berry Filling
- In a small saucepan, combine the strawberries, blueberries, sugar, and lemon juice.
- Cook over medium heat for 5–7 minutes, stirring occasionally.
- If you’d like a thicker filling, stir the cornstarch with 1 tablespoon of water and add it to the berries. Cook for another 1–2 minutes until thickened.
- Remove from the heat and let the mixture cool completely.
Step 2: Arrange the First Layer
- Place half of the ice cream sandwiches in a single layer in the bottom of a 9×13-inch baking dish.
- Trim a sandwich if necessary to fit the edges.
Step 3: Add the Whipped Topping
- Spread half of the whipped topping evenly over the ice cream sandwiches.
Step 4: Add the Berry Layer
- Spoon the cooled berry mixture evenly over the whipped topping.
Step 5: Add the Second Layer
- Arrange the remaining ice cream sandwiches on top of the berry filling.
Step 6: Finish with Whipped Topping
- Spread the remaining whipped topping over the top, creating an even layer.
Step 7: Decorate
- Sprinkle with red, white, and blue sprinkles.
- Garnish with fresh strawberries and blueberries.
Step 8: Freeze
- Cover the dish with plastic wrap or foil.
- Freeze for at least 4 hours, or overnight, until firm.
Step 9: Serve
- Let the dessert sit at room temperature for 5–10 minutes before slicing.
- Cut into squares and serve immediately.
Tips
- Substitute raspberries or blackberries for part of the berry filling for extra flavor.
- Drizzle white chocolate over the top before freezing for a decorative finish.
- Store covered in the freezer for up to 2 weeks for the best texture and flavor.
