What's wacky? You mix it in the baking pan itself, and it's missing some typical ingredients (eggs, butter, milk). Rumor is it started being popular during war rationing, though others refute that. It's found on dozens of sites - I first found it here when looking for a cake to fit in a 9x9 pan (didn't want to make a bigger cake).
This was very popular with my friends and fantastic with vanilla ice cream. Very moist (don't decrease sugar or it'll be dry) and good chocolate flavor. I will definitely make this again!
Mix together in a 9 x 9" pan:
1 1/2 cups flour
3-4 tablespoons cocoa
1 teaspoon baking soda
1 cup sugar
1/2 teaspoon salt
Make three wells; into well #1:
1 tablespoon white vinegar
1 tablespoon vanilla
4 tablespoons melted butter or veg. oil
Pour over the top and mix until combined.
1 cup cold water
Bake at 350 degrees for 30-40 minutes (until toothpick comes out clean).
I didn't frost it because eating it with ice cream!
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