Step 1: Preheat the oven to 325 degrees F.
Step 2: Butter an 8x8 inch cake pan.
Step 3: Melt butter, and set aside.
Step 4: Whip the egg whites to stiff peaks.
Step 5: Beat the egg yolks and sugar until pale and light, about 5-6 minutes.
Step 6: Mix in the melted butter and water, and combine.
Step 7: Add flour, mixing well to break down any lumps.
Step 8: Beat in the milk and vanilla.
Step 9: Add the pumpkin and pumpkin spice, and whisk until smooth.
Step 10: Slowly add the egg whites half at a time, whisking gently until smooth.
Step 11: Pour the batter into the prepared pan.
Step 12: Set the pan on a baking tray, and bake for about 45-50 minutes.
Step 13: The top will still be a little jiggly but will set upon cooling.
Step 14: Cool completely before slicing into squares.
Step 15: Dust with some more confectionary sugar, before serving.
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