Preheat your oven to 350°F. Lightly grease a 13x9-inch baking dish with cooking spray, then line it with parchment paper.
In a large bowl, rub together the sugar, lemon zest, and salt until fragrant. Add flour and melted butter, stirring until a soft dough forms. Press into the pan.
Bake crust for 20–25 minutes until golden. Cool for 20 minutes and reduce oven to 325°F.
In a food processor, blend strawberries, sugar, cornstarch, lemon zest, lemon juice, and salt. Add eggs and yolks; pulse until combined.
Pour filling over cooled crust. Bake for 30–40 minutes until edges are set.
Cool completely, lift from pan, dust with confectioners' sugar, and cut into squares.
Notes
Nutrition per bar: Calories: 190, Total Carbs: 29g (Net Carbs: 28g), Fats: 8g, Protein: 3g.