In an 8X8 square pan/dish, mix together flour, sugar, cocoa, baking soda, and salt with a fork, making sure it is really blended together. Add the water, vanilla, oil, and vinegar, and again, mix together so that it’s really blended together. Use a spatula to scrape down the sides if necessary.
Place in oven and bake for about 30 minutes, or until a knife comes out clean. Hint: If you are going to unmold the cake onto a platter, first cool completely in the pan on a rack…then pour on Glaze. If you are going to serve cake from the pan, pour Glaze over cake while still hot and then cool completely on a rack (2 hours).
4Make Chocolate Glaze:
For the glaze, in a small saucepan, bring sugar, margarine, milk, and cocoa to a boil. Stir frequently; then reduce heat to a simmer for 2 minutes, stirring constantly. It’ll look gloppy, but it’s just the bubbles! Remove from heat and stir for another 5 minutes.
Add vanilla, stir, and immediately pour onto cake. Glaze dries really quickly, so spread it immediately and add any sprinkles now. Let this cool for 1 hour, if you can wait that long!