Preheat the oven to 180 C.
In a bowl, combine coconut flour, sea salt. Add the maple syrup, room temperature coconut oil. Mix until a dough ball is formed. Using hands divide the dough between tarts and press up the sides. Prick bottom of pastry twice with a fork.
Bake about 8-10 min.
In a saucepan, add milk. Cook under the medium heat, add the maple syrup, corn starch, powder of blue berries, vanilla extract, salt. Whisk until start to thicken. Pour into tarts. Refrigerate for a few hours.