Whip egg whites with cream of tartar and 4 Tbsp sugar, until they form stiff peaks. Set aside.
In a new bowl, whip the cream cheese with the brown sugar, pumpkin puree and pumpkin pie spice until light and fluffy.
Add the warm water and softened butter to the cream cheese mixture. Whisk well, or use a hand mixer or standing mixer to ensure even mixing.
Now add the corn starch and egg yolks and whisk until well incorporated.
Finally, gently fold in the whipped egg whites from step 1 to the cream cheese mixture
Pour the batter into a parchment lined 8 inch springform pan, then bake in a 320F preheated oven for 50 minutes. Optional - use water bath to prevent cracks on your cake.
Sift powdered sugar on top. For the best texture and flavor, be sure to let the cake cool and rest overnight in the fridge before eating.
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Notes
*I used organic cane sugar. I would not use sugar free sweeteners for this recipe because the egg whites don't whip as well.
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