1/2 cup cake flour or finely sifted all-purpose flour
1/4 cup powdered sugar
pinch of salt
6 egg whites
1 teaspoon cream of tartar
3/4 cup sugar
1 teaspoon Vanilla
sliced fresh strawberries and whipped cream for serving
Instructions
In a small bowl, whisk together the cake flour, powdered sugar, and pinch of salt. Set aside.
In a large bowl, whip the egg whites using a handheld mixer on medium speed until foamy. Add the cream of tartar and increase the mixer speed to high. Whip until soft peaks form. Continue to whip while adding the sugar 1/4 cup at a time until fully incorporated. Add the vanilla and whip until incorporated.
Turn off the mixer. Carefully fold the cake flour mixture into the egg white mixture until incorporated. Do not overmix.
Pour the batter into two ungreased 15-ounce springform pans, filling to the top. Cover the pans loosely with foil, leaving room for the top to expand.
Place the steam rack into the Instant Pot inner pot and add 1 cupwater. Place one springform pan on top of the steam rack. Secure the lid, ensuring the valve is turned to the Sealing position. Press the Pressure Cook button and set the time to 25 minutes.
When cooking is complete, turn the valve to the Venting position to release the pressure. When all the pressure is released, carefully remove the lid, holding it level to ensure the condensed water does not fall on the cake. Remove the cake with oven mitts. Turn the cake upside down to cool.
Repeat steps 5 and 6 for the second pan.
Let the cakes cool for an hour and then loosen the sides by running a knife around the inside of each pan. Release the sides of pan and run the knife under the bottom of each cake to release it from the pan bottom.
Serve each cake with strawberries and a dollop of whipped cream, if desired.