What energy efficient options are there for small baking quantities? This morning felt like some scones and had to pre-heat my normal oven to 220C which takes like 15m - just to bake a very small batch of scones (literally 4) which took 12m.

I'm a energy conscious bachelor and wont be baking for large quantities often so was wondering what my options there are for quick small scale baking (literally, a handful of scones / mini bundt cake / a couple of pastries).

My microwave is rather dated, so I was wondering if I could get something like:

https://www.lg.com/za/microwaves/lg-MS5696HIT
or

https://www.lg.com/za/microwaves/lg-MH8265DIS
or

https://www.lg.com/za/microwaves/lg-MA3884VC

Much smaller loading area which should heat up quicker and inverter tech should also be more efficient, but can it bake? Or perhaps something else entirely I'm overlooking?
There are a variety of counter-top ovens on the market that fit the bill. They range from fairly simplistic, to feature-rich and quite good. The most basic would easily bake a few muffins.  These are not microwave ovens, but more like your home oven on a smaller scale.  Searching "countertop oven" will yield many results.