Preheat oven to 350 degrees. Spray tart or springform pan with cooking spray.
Mix granola, egg, and oil or butter. Press into tart or springform pan.
Bake for 20 minutes. Cool completely before adding filling.
In a mixing bowl, combine sweetened condensed milk, lemon juice, almond extract, and yogurt. Stir until thoroughly combined and creamy.
Pour over cooled crust and refrigerate while preparing toppings.
Using two saucepans, place in each 1 cup of water, 1 cup of sugar, and 2 tablespoons of cornstarch. Add blueberries to one pan and raspberries to the other.
Cook each pan over medium-high heat, stirring constantly, until mixture starts to bubble. Continue to stir until mixture is thick and clear. Set off burners and allow to cool.
Serve by placing tart on serving platter. Toppings may be added before cutting, or individuals may choose their topping(s) after the tart is cut and served.
Notes
This is a quick and light summer dessert. Fresh fruit can be substituted for toppings.