Some questions answered: (I will update the main post later)
When I say that your entire entry must be edible, I am not counting containers or other items that are necessary for supporting your dessert. Plates, glassware, cupcake wrappers, popsicle sticks or scewers for cake pops would all be acceptable simply as means of keeping your dessert contained and edible. However, these accoutrements cannot be the primary means of decoration that goes towards your AC or TBT theme.

When I say that your entire entry must be edible, I am not counting containers or other items that are necessary for supporting your dessert. Plates, glassware, cupcake wrappers, popsicle sticks or scewers for cake pops would all be acceptable simply as means of keeping your dessert contained and edible. However, these accoutrements cannot be the primary means of decoration that goes towards your AC or TBT theme.
Yes, I had to look them up but I think these could be considered the same as Hershey Kisses or candy corn or things of that nature, so I will allow them!Question: I have these little cookies in the shape of mushrooms (called Chocomont), am I allowed to use these as decorations in my idea or are those not allowed?

Yes, you may absolutely use store-bought mixes. You don't have to make everything completely from scratch, but you can't buy already made cakes or brownies.Sorry if this is a silly question, but is using stuff like premade cake mix/brownie mix/etc acceptable?
I was thinking that I'd allow entries based on ACNH food items, however this one is very plain and looks no different from regular scones. I think it would be better if you could find a way to dress them up a little bit to visually match the theme as well.If I make plain scones from scratch based on this ACNH recipe, will it count as animal crossing themed even if they just look plain?