Begin by soaking the raw cashews in water for at least 2 hours or overnight. Once soaked, drain and rinse the cashews.
In your food processor, combine the soaked cashews, Medjool dates, coconut oil, lemon zest, a dash of sea salt, and vanilla extract. Blend until smooth and creamy.
Take small amounts of the crust mixture and press it into the mini tart pans, creating an even layer on the bottom and up the sides.
In a bowl, combine the blueberries, chia seeds, lemon juice, and maple syrup. Mix gently until the blueberries are coated.
Once the crusts have set, spoon the blueberry mixture into each tart shell, filling them generously.
Return the assembled tarts to the refrigerator for at least 30 minutes to allow the filling to firm up before serving.