Mix the almond flour, collagen powder, grapeseed oil, honey, vanilla extract and egg in one bowl. Combine well.
Roll the dough into a large ball and wrap in parchment paper. Put it in the freezer for an hour or so to harden a bit, which will make the dough easier to roll out.
If the jam needs to be thickened, mix in 1 tsp or 2 tsp of coconut flour – start with a 1/2 tsp and add more if needed, after combining well.
Once the dough is cold, remove one ball of dough from the freezer and roll it out – place a piece of parchment paper on top of the dough as well as underneath the dough to facilitate rolling it out without sticking.
Once the dough is rolled out, remove the top layer of parchment paper, and begin cutting out heart shapes with a cookie cutter, or else, you can make these into circular sandwich cookies using a tablespoon, and flattening each cookie with the palm of your hand.
Cut out heart shaped cookies, and place them on to a parchment paper-lined baking tray. Once you have the bottom cookie, begin adding a dollop of jam to each cookie and then proceed to roll out more dough, as needed, for the top cookie. Repeat this process until all the dough is done.
For the larger heart shaped cookies, you can make a larger heart-shaped cookie using a knife, if your cookie cutters are not large enough. From there, place the bottom cookie onto the baking tray once again, and cover it in jam, leaving a small edge around the heart. Add a smaller-sized heart-shaped cookie to the middle.
Bake the cookies in a preheated oven at 350 for 10-13 minutes, depending on the size of your cookies. Just keep an eye around 10 minutes to avoid getting them overly brown. Allow to cool, and store in the fridge or freezer.