It sounds like you're working really hard on this birthday cake. I'm sure it will be terrific. What are your MIL's cake preferences? I am guessing that they differ from yours.
The cake recipe that I enjoy most is Carrot Cake from the Complete Vegetarian Cuisine by Rose Elliot. It calls for 2 eggs, but the flax substitution could be made easily. I know you said no refined sugar, but does that include cane sugar (pardon my ignorance)? This recipe uses wheat flour, coconut, pineapple, carrots and I throw in raisins too. I made it three years in a row for ds's birthday then he told me that carrot cake is MOMMY'S favorite and HIS is chocolate
The party guests were more enthusiastic about the cake than he was. I could share the recipe with you if you'd like.
Happy baking!
The cake recipe that I enjoy most is Carrot Cake from the Complete Vegetarian Cuisine by Rose Elliot. It calls for 2 eggs, but the flax substitution could be made easily. I know you said no refined sugar, but does that include cane sugar (pardon my ignorance)? This recipe uses wheat flour, coconut, pineapple, carrots and I throw in raisins too. I made it three years in a row for ds's birthday then he told me that carrot cake is MOMMY'S favorite and HIS is chocolate

Happy baking!