Preheat the oven to 350 degrees F. Grease a 10x15 inch high sided
baking dish. I used a 10x15 inch pyrex pan, but a lasagna baker
would work too.To make the cake, place the butter, cocoa powder
and coffee in a medium size sauce pot. Melt the butter over
medium heat until the mixture is smooth and combined. Remove
from the heat and add the flour, sugar, baking soda and salt. Whisk
until just combined, it is ok if some flour chunks remain. Whisk in
the eggs, vanilla and greek yogurt until just combined and smooth.
Again, it is ok if the batter is a little lumpy.Pour the batter into the
greased baking dish. Bake for 20 minutes or until just set on top.
Remove from the oven.
While the cake is baking, make the gooey chocolate. Combine the
sweetened condensed milk and chopped dark chocolate in a small
sauce pan and slowly melt the chocolate into the sweetened
condensed milk over low heat until melted and smooth. Keep
warm.Once the cake is out of the oven pour the gooey chocolate
over the cake, spreading it out in an even layer.To make the
meringue. Add the egg whites to a clean mixer bowl. Using a clean
whisk attachment, beat on high speed until you have soft peaks.
With mixer running, slowly add sugar. Once all the sugar has been
added, add the vinegar. Continue beating until stiff peaks form,
about 4 minutes. Gently fold in the corn starch and cocoa powder
being careful not to deflate the whites. Drizzle the melted chocolate
over the meringue. Do not stir the melted chocolate completely into
the meringue as you want streaks of chocolate.
Carefully spread the meringue over the cake. Bake for 15-20
minutes or until the meringue is just set on top. Remove the cake
and allow to cool 1 hour. Cut and dust with powdered sugar before
serving. This can be served slightly warm, at room temp or straight
from the fridge.
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