Hello Mike, just to help you in your quest to have treats that are not bad for you!! I have just looked on my jar of Stevia, Canderel Green:- 1 teaspoon of Canderal Green (2kcals) is equivalent in sweetness to1 teaspoon of sugar (20kcal). So 1 teaspoon of CG is(0.5g) 1 teaspoon of sugar(5g).
The simple basic sponge mix is 1 egg, 2ozs Butter or simular, 2ozs Self raising flour, (2ozs sugar), so just change the sugar for the canderal, but this would need to be to your own taste, I think to swop like amount would be far toooo sweet. If you like cooked apple, use eating apples as theya re naturally sweet, so ne need for extra sweetening.
If you like crumble make the mix 2ozs plain flour, 1oz butter or such, and use canderal to personal taste, over the eating apples, with cream or diabtic ice cream,
but if you have to have custard then again only use 1/2 pint of semi skimmed to 1/2 tablespoon of custard powder and canderal to your taste. Please remember to eat lower carb foods if you are going to treat yourself, and then you can balance your bs levels, and achieve your goals, good luck and let us know how you go, ttfn