Ingredients
GRAHAM CRACKER CRUST
2 1/2 cups (about 250 g) graham cracker crumbs (about 16 full sheets, finely crushed)
1/2 cup (113 g) unsalted butter, melted
2 tablespoons (25 g) granulated sugar
1/8 teaspoon fine salt
BLUEBERRY LAYER
3 cups (about 440 g) fresh blueberries (or frozen, not thawed)
1/3 cup (67 g) granulated sugar
1 tablespoon (15 ml) fresh lemon juice
1 1/2 tablespoons (12 g) cornstarch
2 tablespoons (30 ml) cold water
LEMON CREAM CHEESE LAYER
16 ounces (452 g; two 8-ounce blocks) full-fat block cream cheese, softened to room temperature
3/4 cup (90 g) powdered sugar, sifted
1 teaspoon (5 ml) pure vanilla extract
1/2 cup (120 g) full-fat sour cream, room temperature
2 tablespoons (30 ml) fresh lemon juice
1 tablespoon finely grated lemon zest (about 1 large lemon)
1 1/2 cups (360 ml) cold heavy whipping cream (at least 36% milk fat)
TOPPING
3/4 cup (180 ml) cold heavy whipping cream
2 tablespoons (15 g) powdered sugar
1/2 cup (75 g) fresh blueberries
1 teaspoon finely grated lemon zest
1 ounce (28 g) white chocolate bar, for curls
Optional: 1 lemon, very thinly sliced and halved; small fresh mint leaves
Instructions
1. Heat the oven to 350°F (175°C). Set the cream cheese and sour cream out to soften (cube the cream cheese so it softens faster).
2. Stir the graham crumbs, 2 tablespoons sugar, and salt together; stir in the melted butter until it looks like damp sand. Press firmly and evenly over the bottom of an ungreased 9×13-inch dish with the flat base of a glass or measuring cup.
3. Bake 10–12 minutes, until fragrant and slightly darker. Cool completely, about 35 minutes.
4. While the oven heats and crust bakes, combine the blueberries, 1/3 cup sugar, and 1 tablespoon lemon juice in a 2-quart saucepan. Cook over medium heat, stirring, 5–6 minutes, until juicy, gently crushing about a third of the berries (frozen berries need 2–4 minutes longer).
5. Whisk the cornstarch into the cold water, re-stir, and pour into the berries. Stir constantly until the sauce returns to a boil, then let it bubble 1 full minute until thick and glossy. Spread in a shallow dish, cool 10 minutes, then refrigerate until completely cold, 30–45 minutes.
6. In a clean, chilled bowl, whip the cold 1 1/2 cups heavy cream to stiff peaks, 3–4 minutes; refrigerate. In a large bowl, beat the softened cream cheese alone until completely smooth, add the powdered sugar and beat again, then beat in the vanilla, sour cream, lemon juice, and zest, scraping the bowl.
7. Fold one-third of the whipped cream into the cheese mixture, then fold in the rest in two additions until no streaks remain.
8. Spread half the lemon cream over the cooled crust. Dollop and gently spread half the cold blueberry sauce over it. Carefully spread the remaining cream on top, then the remaining sauce. Drag a knife through the top in 3–4 loose S-shaped swirls.
9. Cover without touching the surface and refrigerate at 40°F (4°C) or below for at least 5 hours, preferably overnight.
10. Just before serving, whip the 3/4 cup cream with 2 tablespoons powdered sugar to stiff peaks and pipe 12 rosettes with a 1M tip. Add blueberries, lemon zest, white chocolate curls (pull a peeler along a slightly warm bar), and optional lemon slices and mint. Cut into 12 squares with a hot, dry knife, wiping between cuts. Serve chilled.
Notes
TIMING: 40 minutes active prep (10 crust + 15 filling + 5 layering + 10 topping/decorating) + 22 minutes cooking (12 crust bake + about 10 stovetop sauce) + 330 minutes additional time (about 30 minutes net cooling of crust and sauce + 300 minutes minimum chill) = 392 minutes (6 hours 32 minutes) to the first slice. The original post’s 5 h 42 min omitted cooling and decorating. Sauce cooking overlaps oven preheating and crust baking, and cream cheese softening overlaps crust and sauce work, so they are not double-counted. Planning estimate, not a measured test. Overnight chilling (8–12 hours) gives the cleanest squares.
CORRECTIONS vs. the original post: cornstarch raised from 1 to 1 1/2 tablespoons and the sauce must boil 1 full minute after the slurry (cornstarch does not fully thicken below a boil); real total time 6 h 32 min; topping whipped cream defined (3/4 cup heavy cream + 2 tbsp powdered sugar = about 1 1/2 cups); ‘pinch of salt’ = 1/8 teaspoon.
CREAM CHEESE: Full-fat BLOCK cream cheese at true room temperature (about 1 hour; cubes soften faster). Beat it alone before adding sugar and liquids to avoid lumps; sift the powdered sugar.
WHIPPED CREAM: Use cold cream (straight from the fridge) and a chilled bowl and beaters; whip to stiff peaks but stop before it looks grainy.
BLUEBERRIES: Frozen berries work straight from the freezer; cook a few minutes longer and confirm a full boil. Cool the sauce completely before layering so it stays distinct and does not melt the cream.
CUTTING: Chill overnight; score a 3×4 grid; use a long sharp knife dipped in hot water and wiped dry before each cut; lift the first square with an offset spatula. In a 9×13 dish the layers are about 1 1/2–2 inches tall.
FOOD SAFETY & STORAGE: Perishable dairy dessert. Keep covered at 40°F (4°C) or below; enjoy within 3–4 days (conservative quality guideline). Do not leave out more than 2 hours total, or 1 hour above 90°F (32°C).
MAKE-AHEAD: Layer up to 1 day ahead; add whipped rosettes and garnishes on serving day (lemon slices and mint wilt).
FREEZING: Freeze undecorated, tightly wrapped, up to 1 month for best quality; thaw overnight in the refrigerator, never on the counter. Cornstarch sauce may weep slightly after freezing. Add fresh topping after thawing.
ALLERGENS: Contains milk and wheat (graham crackers; some brands contain soy or honey). Egg-free. Vegetarian; not gluten-free or vegan.
NUTRITION: Approximate ingredient-based estimate per 1/12 of the pan including topping; not laboratory analysis. Images are AI-assisted illustrations guided by the Sweet Delights Haven post photo, not photographs of a kitchen test.
- Prep Time: 40 minutes
- Additional Time: 330 minutes (net cooling about 30 minutes + minimum 5-hour chill)
- Cook Time: 22 minutes
- Category: Dessert
- Method: Baked crust / Stovetop / Chilled
- Cuisine: American
- Diet: Vegetarian