To make the crust and crumble, combine flour, sugar, and a dash of salt in a food processor fitted with a pastry blade. Add in cold, cubed butter and pulse together until pastry dough is crumbly and butter is evenly distributed.
Remove ½ cup of the mixture and reserve to use as the streusel topping. Press the remaining mixture evenly into the a 8x8 baking dish lined with parchment paper. Bake at 350 F for 15 minutes.
Mix together yogurt, sugar, vanilla, egg, lemon juice and lemon zest together. Gently fold in the strawberries. Spread over baked crust and top with streusel. Return to oven for 45-50 minutes.
Once the steusel is golden, remove from the oven and cool for 1 hour. For best results refrigerate overnight and then slice into 12 bars and enjoy.
These bars were just the Spring treat I was looking for to use up some strawberries before they went bad. SO delicious an I can't wait to make them again!