Add cereal to blender or food processor. Grind for a few seconds, until a fine powder, is formed, similar to cornmeal. You may have to work in two batches to fit the 5 cups of cereal.
Add 2 cups of the ground cereal to a medium-sized bowl. Add flaxseed and maple syrup, stir to combine. Add melted coconut oil and stir to combine.
Lightly spray the bottom of a 9-inch tart pan with a removable bottom. Add the crust to the pan a spread out evenly on the bottom and the sides, pressing down firmly. Transfer crust to the freezer as you prepare the filling.
Yogurt Filling
In a blender or food processor add yogurt, blueberries, vanilla and maple syrup. Puree until a smooth purple-colored mixture is achieved.
Remove the crust from the freezer. Add as much filling the can fit into the crust. Spread evenly on the surface and freeze for 15 minutes to allow the crust and filling to set.
Assembly
Add desired fruit to the top of the tart and sprinkle with almonds, freeze for 5 minutes or refrigerate until ready to serve. Carefully remove the outside tart pan ring right before serving.