I was talking about making a cake vape with my wife last week and mentioned adding brown sugar. She said brown sugar will turn it more cookieish than anything else. Honestly, I think TFA vanilla swirl is a must ingredient if you are looking for white or vanilla cake. I think tfa vanilla swirl with either vienna cream or vanilla classic is cake. Maybe add .5-1% of fa caramel for moistness?
I agree with your wife - I use TFA Brown Sugar to make cookie vapes taste baked. Using some FA Caramel with it adds the flavor of the softer centers, or undercooked cookies (I like 'em like that).
Got some AP? (acetyl pyrazine?) I love how it made cheesecake so easily. I have some batter-tasting recipes to try a little AP in sometime soon. The right amount should make recipes taste bready (if they're not too sweet) or cake-like (if there's plenty of sweetness). "Right amount" can be less than 0.25%, so it can take some rounds of experimenting. But my experiments won't be soon.
I have so many little batches to vape, I GOTTA stop mixing new stuff! I'm just gonna vape combinations of leftover spicy cookies, creamy cocktails, and cheesecake for a few days. I think I can stand that.