Combine the wet ingredients in a large bowl and let sit for a couple of minutes.
Combine the dry ingredients in another large bowl.
Pour the wet ingredients into the dry ones and combine with a silicone spatula. Let sit for a minute just so that the psyllium husk powder and the coconut flour absorbs the liquid.
Add the berries to the batter and mix.
Place a piece of parchment paper over a 9x13" pan. Add the batter inside and spread evenly.
Bake for 35 minutes in your preheated oven. Check the middle of the cake with a toothpick, if it's still a bit gooey, bake another 5 minutes.
Notes
Good in the fridge for 5-6 days in a sealed container. You can also freeze them, and microwave or thaw them when you want to eat them.Get the equipment used here: Rectangular Baking Dish 9x13"