Preheat the oven to 350ºF and regulate the rack to the center place. 

Place the almond flour, coconut flour, gelatin, sugar, and arrowroot flour within the bowl of a meals processor and pulse 4-5 instances to include. Add the butter and pulse for eight 1-second pulses, or till the combination is like moist sand. Course of agin till the combination types a agency dough. 

Spoon the dough right into a buttered 8×8-inch baking dish and evenly press to cowl the underside of the pan. Bake for quarter-hour, or till the crust is simply turning golden brown on the sides. Let cool when you make the lemon and cranberry layers. 

For the cranberry layer:
Place the cranberries and sugar in a medium sauce pan and warmth over medium. Stir often, and cook dinner till the berries burst and the combination is the feel of jam, about quarter-hour. Add the lemon zest. Pour right into a blender and mix till clean. Pour over the baked crust and unfold evenly. 

For the lemon layer: 

Place the melted butter, honey, eggs, yolks, lemon zest, simply and salt on the highest of a double boiler (or place a heatproof glass bowl over a small pot of simmering water). Whisk repeatedly till the combination turns thick, like a pudding, about 6 minutes. Instantly pour the lemon combination evenly over the cranberry layer to create 2 distinct layers. 

Bake for 23 minutes, or till filling is ready on the sides. It is going to nonetheless jiggle a bit within the center when shaken, however don’t fear — the filling will set because it cools. Cool to room temperature after which refrigerate till chilly. Mud with powdered sugar, lower into bars and serve.