So Esquita brownie mix is just chocolate, flour and sugar? Really, if you're going to buy eggs and butter, you might as well do the whole thing yourself.
I have a recipe for what tastes like Jiffy Cornbread Mix in the US, sweet rather than sharp. I use polenta and Royal polvo de horno. I sift the white flour (000, I'll spring for 0000 if it's on sale ;^) together with the corn meal through a plastic strainer. Great stuff.
I like to pimp my Exquisita brownies by adding about 5 teaspoons of instant coffee granules (mixed with hot water), a splash of vanilla essence, and toasted crushed walnuts. They're a real upper.
fifs2, I have made Nigella's brownies on many occasion, just standing up for the exquisita mix, in a hurry and when you don't want to splash out on chocolate, it's pretty damn good.
That's the recipe I use. I put the polenta (cornmeal) in the milk and soak it for an hour. Everything else is the same (with the above mentioned royal brand of baking powder).
Last time I put in some jalapenos I bought at Carrefour and it was really good
We had cornbread muffins at our brunch at Malvón today and they were awesome.
If you don't have the ganas to make muffins, but have the plata to buy them, then I would give Malvón a visit to see if you could buy them for Turkey Day.