Preheat the oven to 400°F.
Prepare oats by grinding in a grinder into fine flour.
In a mixing bowl add your oat flour with 3 tablespoons of sugar and a pinch of sea salt. Sift together.
Incorporate your melted butter. Mix in the butter until the oat flour and butter mixture becomes a cookie crumble.
Press cookie mix into a 9×9 square baking dish, evenly.
Bake for 14-16 minutes until the cookie oat base has browned a little.
Once it’s baked, remove it from the oven and let it cool completely for approximately one hour.
Once the oatmeal cookie crumb has cooled, evenly layer blueberry pie filling.
Zest the peel of your lemon, set aside.
Squeeze out the juice from the lemin into a small ramekin, set aside.
In a mixing bowl using a hand mixer, mix together whipping cream, the juice from a whole lemon and the remaining sugar.
Whip until it comes together forming nice peaks with the beaters.
Evenly spread the whipped topping over the blueberry pie filling and place it into the dish, in clumps.
Use the back of a soup spoon and evenly spread the whipped mixture over the blueberry pie filling.
Top the whipped mixture with lemon zest. Chill for 2 hours or overnight.
Cut into squares and serve.