Cream butter and sugar. Separately, beat the egg, and reserve half for later.

Dissolve baking soda in milk.

Add to creamed mix along with half beaten egg, and all other ingredients.

Roll out and cut into rounds. I recommend doing this on a floured surface, just from general experience baking biscuits.

Now, the next instruction has me a little perplexed. I think Janet means us to add the rest of the egg after the biscuits are ready to bake. I would try brushing the egg over the tops of the biscuits and see how that goes.

In classic Janet fashion, we have no instructions for baking time nor temperature. Try 180°C for 15 minutes and see how you go.