It should be fine as long as you weigh the flour and don't use the cup measurements. 1 cup of all-purpose flour weighs more than 1 cup of spelt flour so if you use cups you'll end up with the wrong amount. Hope that helps!

Hi can I use all purpose flour instead of spelt flour? And is it still the same measurements?

The frosting will melt if it gets warm. I don't think it will survive being left in the car. Most vegan frosting isn't great at staying stable when it gets warm. I'd recommend looking for a frosting recipe that uses vegan shortening as that makes it more stable and less likely to melt. Unfortunately it's not something that I use in my recipes because I don't really like the ingredients used in it but in your case it would be the best option. I would also use more powdered sugar than the recipe calls for to make doubly sure it stays firm on your journey.
I hope that helps!

Thanks!

The flavour and heartiness of spelt works really well in this recipe. You could use regular flour though. Just be sure to weigh it so you get the exact amount.

Vegan cakes need more baking powder than non-vegan cakes to get a good texture because eggs provide leavening, so when they are removed you need something to provide that in their place. This is a pretty big cake hence why 2 tablespoons are called for. You can't taste the baking powder at all. I can't speak for what Polish baking powder is like though but I would imagine it's the same everywhere.

I'm glad the cake went down well! With regards the coconut milk, some brands work better than others. Some barely solidify at all and even with a brand that usually works, occasionally you will get a dud. I test them when I'm at the store. If you give the can a shake and it feels really sloshy, don't buy it. If you shake it and there isn't much sloshing and it feels solid, that's the one you want.