Help!! Cake tins

[Twims]

Have just been asked to make a cake for tonight!!!!

Recipe calls for an 18 x 28 tin - have a 21 by 21 can I use that?? and then use the rest of the mixture (?) as cupcakes?

Don't see why not - but watch the cooking time - may well cook quicker as it's a smaller volume.

cake

Nice! I made a chocolate yoghurt cake for dd's birthday - it was v.nice, and kept very well.

Would a 27x27 circular baking dish be better??

Oh blee - hard maths:

OK, assuming each dish is the same depth, the areas are:

18 x 28 = 504
21 x 21 = 441
27 dia circle = 13.5 squared x pi = 572.

So the second one would be a smaller cake, with spare for cupcakes, and the third would make a more shallow cake - again, might take less time to cook as it's not so deep.

Habbi you're my new best friend

What's the dif between baking powder and bicarb?

Bicarb is pure sodium bicarbonate, and needs an acidic ingredient to counteract the bitter taste (yoghurt would do this). This explains it really well.

I put baking powder instead of bicarb!! Will people know ?

Think that way round is ok: You can substitute baking powder in place of baking soda (you'll need more baking powder and it may affect the taste), but you can't use baking soda when a recipe calls for baking powder.