In a large mixing bowl, prepare your coconut whipped cream with your chilled coconut cream. Follow these instructions to make a double batch, sweetened to taste (I found 6-8 Tbsp (42-56 g) to be the right amount // amounts as original recipe is written // adjust if altering batch size). Transfer whipped cream to a large freezer bag (for piping) and set in the refrigerator to chill completely. Rinse out the mixing bowl to use for the batter.
Measure out almond milk in a liquid measuring cup and add apple cider vinegar (or lemon juice) and baking soda and stir. Set aside.
In your large mixing bowl, prepare flax eggs by combining water and flaxseed meal. Let rest for 5 minutes while you prepare your other ingredients.
Add the oil, coconut sugar, and maple syrup and whisk to combine.
Next add applesauce, vanilla, and salt, and whisk to combine. Then add almond milk mixture and whisk again until everything is thoroughly incorporated - about 30 seconds.
Lastly, add baking powder, cocoa powder, almond meal, oat flour, and gluten-free flour, and whisk to combine, making sure no large clumps remain.
Transfer batter to the refrigerator to chill/thicken for 20 minutes, and preheat oven to 350 degrees F (176 C). Grease two large baking sheets with non-stick spray (if you don’t have two baking sheets, just use one and bake the cakes in 4 batches // use fewer or more baking sheets, as needed, if altering batch size).
Once the oven is preheated, scoop out 1 heaping Tbsp amount of batter onto the prepared baking sheets, leaving at least 1-inch of room for spreading. Use your tablespoon to slightly spread them into a small disc. One standard baking sheet should fit 12 cakes. Repeat on second baking sheet.
Bake for 10-14 minutes, or until the edges appear dry. (I found 12 minutes to be the perfect time.) Remove from oven and let rest on baking sheet for 5 minutes, then carefully transfer to cooling racks to cool completely.
Repeat this process, baking the mini cakes until all batter is used - you should have about 48 total cakes (amount as original recipe is written // adjust if altering batch size).
Once the cakes are completely cooled to the touch, clip a small corner of the coconut whipped cream bag off and pipe a generous amount (see photo) of coconut whipped cream onto the under-side of half the cakes (24 as original recipe is written // adjust if altering batch size). Carefully top with another cake of similar size and shape and press down slightly.
Arrange on large serving plates or a cooled baking sheet and cover loosely with plastic wrap. You can enjoy these immediately; however, I found them to hold up better after 1 hour of refrigeration (and even better after 6 hours or overnight).
Leftovers will keep covered with plastic wrap in the refrigerator for 3-4 days.
*For the gluten-free flour blend, I've tested both with my DIY Blend and Bob's Red Mill Gluten Free 1:1 Baking Blend and found that I slightly preferred the Bob's blend in terms of the cake's texture. However, both will do! *Nutrition information is a rough estimate calcualted with generous amounts of coconut whipped cream filling. *Prep time does not include chilling coconut cream overnight. *Adapted from my 1-Bowl Chocolate Hazelnut Cake.