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1
Microwave the sweet potatoes on High for 15 minutes. Turn over and microwave another 12 minutes, or until a knife goes all the way through. Set aside and allow to cool for 20 minutes.
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2
Reserve 1/2 cup of cake mix and set aside. Combine the remaining cake mix, melted butter and egg in a bowl and stir until a wet dough forms.
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3
Grease the bottom of a 9 x 13 metal baking pan. With your fingers, press the dough into the bottom of the pan, all the way to the edges. Set aside.
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4
Cut each sweet potato in half lengthwise, scoop out the inside and place in in another bowl. Discard skins.
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5
Wisk together the sweet potatoes, evaporated milk, eggs and sugar. Taste. Add more sugar until the mixture is as sweet as you want it to be.
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6
Pour the mixture on top of the dough, jiggling the pan so that it distributes evenly.
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7
Combine the reserved cake mix, 1/4 cup of sugar and cinnamon in a small bowl. Cut in the cubed butter until little pea-sized balls form. Sprinkle over the sweet potato mixture.
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8
Bake at 350 degrees for 45-50 minutes, or until the mixture sets. You may want to place foil over the top at 35 minutes if it starts to brown too much. Remove from the oven and allow to cool for 30 minutes. Place in the freezer to chill for an hour. Cut into squares. Serve with whipped cream.
