I've lost my baking prowess... why is it doing this?

[Pancakeflipper]

Photo of today's cake baked. It's a chocolate tray bake and it's cooked but doesn't look like it. Its flat.

Am I over mixing (Kenwood mixer,)?

Undermixing (I don't think I did)

Oven temp issue?

Or something else ?

This occurred with a cake last werk - victoria sponge but I'd been baking with DS and put it down to him not measuring out ingredients properly.

What did you put in it ? Baking soda ? Did you put enough ?
Also, baking soda should ideally be put last and not sit resting for very long once wet.

If you used self raising flour it might be old.

Or the raising agents?

Check dates on raising agents, they really do expie. Are you beating the butter and sugar enough to really get air in? Check your oven temperature as well to make sure it is getting hot enough.

2 teaspoons of baking powder.

Both flour and baking powder are well in date...

Are you testing it before you remove it. Is it rising then collapsing after? You’re sure it’s not undercooked?

Check if your oven temperature is working correctly? I had something similar when the oven stat was in the blink and the temperature I set it at wasn't actually what it was inside

I had a similar issue once. Suddenly every cake I made was awful, even basic cakes using recipes I'd been using for years. It turned out that the seal on the oven was damaged so it was not staying hot enough

I thought it was cooked. Tested it and no batter at all.

Beginning to think it is an oven temp issue.... I'm using recipes I've used for ages and suddenly - saggy-ness.