Ingredients

1 ½ cups egg whites, at room temperature

1 ½ teaspoons cream of tartar

1 ½ cups granulated sugar, divided

1 cup cake flour, sifted

1 tablespoon all-purpose flour (for coating blueberries)

1 tablespoon fresh lemon zest

1 teaspoon vanilla extract or lemon extract

1 cup fresh blueberries

¼ teaspoon salt

Instructions

Step 1: Preheat your oven to 350°F (175°C). Prepare an ungreased 10-inch tube pan — do not grease it to allow the batter to climb properly.

Step 2: In a medium bowl, sift together cake flour, ½ cup of the granulated sugar, and salt at least 3-4 times. Set aside.

Step 3: In a large, clean, grease-free bowl, beat the room temperature egg whites on medium speed until foamy.

Step 4: Add cream of tartar and increase mixer speed to medium-high. Continue beating.

Step 5: Gradually add the remaining 1 cup sugar, about 1-2 tablespoons at a time, until firm, glossy peaks form.

Step 6: Fold in lemon zest and vanilla or lemon extract gently.

Step 7: Sprinkle one-third of the sifted flour mixture over the egg whites. Gently fold using an upward motion until just combined. Repeat with remaining flour in two additions, being careful not to overmix.

Step 8: Toss blueberries lightly in the tablespoon of all-purpose flour to prevent sinking. Gently fold them into the batter.

Step 9: Spoon batter evenly into the ungreased tube pan. Run a knife through the batter to release large air pockets.

Step 10: Bake for 35-45 minutes until golden brown, springs back when touched, and a skewer comes out clean.

Step 11: Immediately invert the pan onto its feet or over a bottle neck to cool completely upside down for 1½ to 2 hours.

Step 12: Once cool, loosen edges with a knife, invert onto a plate, slice with a serrated knife, and enjoy your moist blueberry lemon angel food cake!

Tips & Variations

Use room temperature egg whites for maximum volume; if needed, warm them gently in a bowl over warm water.

Avoid any grease in your mixing bowls or utensils to ensure egg whites whip properly.

Fold the flour mixture gently and just until combined to keep the cake tender and airy.

Coat blueberries lightly with flour to keep them suspended evenly in the batter.

Try substituting cake flour with a mix of all-purpose flour and cornstarch if necessary.

Experiment with lime or orange zest, or use raspberries or chopped strawberries instead of blueberries for different flavors.

Drizzle with a simple lemon glaze or serve with whipped cream and extra fresh berries for an elegant presentation.

Storage

Store the cake in an airtight container at room temperature for 2-3 days to keep it moist and fresh. For longer storage, refrigerate wrapped tightly for up to 5 days and bring to room temperature before serving. Angel food cake can also be frozen whole or in slices for 2-3 months; thaw at room temperature before eating. Avoid microwaving thawed cake to maintain texture.

FAQs

Can I use frozen blueberries instead of fresh?

Fresh blueberries are recommended to keep the cake light and prevent excess moisture. If using frozen, thaw and drain them well, then toss in flour before folding into the batter to minimize sinking and sogginess.

Why do I need to cool the cake upside down?

Cooling the angel food cake upside down prevents it from collapsing by allowing gravity to keep the cake’s delicate structure stretched and stable as it cools, preserving its height and airy texture.