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In a mixing bowl, combine the whipped cream, yogurt, lemon zest and lemon juice until well combined.
In an 8x8-inch pan (lined with parchment paper if you wish), layer the graham crackers and top with the lemon filling.
Repeat layers until you run out of mixture.
Freeze for 15 minutes.
Heat the lemon frosting for 30 seconds in the microwave until smooth. Pour over the icebox cake.
Freeze for at least 2 hours before slicing and serving.
Whipped cream: You may use homemade or store bought. You'd need two containers if using storebought.
Lemon frosting: Duncan Hines is gluten-free.
Serving: 1 slice (6 servings), Calories: 151kcal, Carbohydrates: 15g, Protein: 2.6g, Fat: 9.4g, Cholesterol: 31mg, Sodium: 26mg, Fiber: 0.4g, Sugar: 6.9g