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Spray 8x8 or 9x9 square glass baking pan with nonstick cooking spray and line parchment paper (optional). Lightly spray parchment with more cooking spray and set aside. Preheat oven to 350° F.
In a medium-sized bowl, mix butter, flour, powdered sugar, and vanilla extract until a dough starts to form. If you notice the dough not coming together, your butter may be too cold. Mix with your hands so the heat from your hands can help bring the dough together.
Press dough evenly into the bottom of the prepared pan. Bake 12-15 minutes or until edges are barely golden brown.
While crust bakes, make the lemon filling. Whisk sugar together with lemon juice, eggs, and flour. Once the crust is done baking, pour lemon filling over the hot crust.
Bake 20 minutes or until set. Cool completely, cut into squares and top with powdered sugar.