Preheat an oven to 350 F. Place frozen berries in the bottom of an 8×8 glass dish. Add the granulated sweetener and a pinch of salt. Mix until combined. There will be some sugar at the bottom of the pan and that is fine.
Step 2
In the meantime, combine the almond flour, melted butter, ½ cup granulated sweetener and cinnamon together until it is well combined and crumbly.
Step 3
Spread over the top of the fruit evenly and bake for 40-45 minutes until the crumb topping is nicely browned and the fruit is bubbling.