Grease a 9-inch tart pan or 3-4 4-inch tart pans. Set aside.
In a medium bowl, stir together the flour, oats, cocoa powder, coconut oil, agave nectar, and salt. Press the mixture into the tart pan or pans until evenly distributed. Set aside.
To a medium bowl, add the espresso powder, chocolate chips and jam. In a small saucepan, heat the coconut milk over medium-low heat until hot and simmering. Remove from heat and pour the coconut milk over the chocolate chips or chunks. Stir until the chocolate has melted.
Pour the mixture into the tart pan or pans. Decorate with fresh blueberries and place the tart immediately in the fridge to chill for 4-6 hours before serving.