Instructions Prepare the Crust: Preheat your oven to 350°F (175°C). In a medium bowl, mix the flour, softened butter, and powdered sugar until it forms a dough. Press this dough evenly into the ...

Butter a 9-inch square nonstick baking pan. In a food processor, pulse 1 cup flour, 1/4 cup sugar, 1 teaspoon lemon zest and salt. Add butter and pulse until a soft, crumbly dough forms.

Grease a 21cm square cake tin with butter and line with baking paper. Cream butter, sugars and vanilla together, using a wooden spoon or a stand mixer with a paddle attachment, until pale and creamy.